SAES-422 Multistate Research Activity Accomplishments Report
Sections
Status: Approved
Basic Information
- Project No. and Title: NC_old170 : Personal Protective Technologies for Current and Emerging Occupational and Environmental Hazards
- Period Covered: 10/01/2013 to 09/01/2014
- Date of Report: 10/24/2014
- Annual Meeting Dates: 07/31/2014 to 08/01/2014
Participants
Accomplishments
Objective 1: Examine acceptance and barriers to acceptance of PPE products and protective clothing, including hand, foot, and headwear: A. foundation anthropometric and ergonomic research B. user acceptance and barriers to acceptance in domain areas of fire protection, chemical protection and medical environments.
• NY and CA worked on a pesticide protective glove study to gain further information on applicators’ knowledge of glove materials and thickness issues. The study has also been designed to examine the relationship between glove knowledge and factors such as main source of glove information and number and type of licenses an applicator has. • CO determined the impact of foot morphology on footwear fit and comfort, using 3D foot scanning technology. The BMI was positively related with the six identified landmarks of foot anthropometry and showed a negative relationship with footwear comfort. CO further evaluated subjective perception of footwear fit and comfort to supplement findings of the anthropometric approach. • Four participating institutions –CO, HI, NY (SUNY-Buffalo, BUFF), and NY (Cornell) conducted focus group interviews about firefighters’ perceptions about their turnout gear, boots, and gloves. • MD collaborated with WA to conduct a wear study of disposable/limited use coveralls for applicators in the tree-fruit industry. This study examined whether lightweight, disposable coveralls would be a viable option for those applying products with open-cab, airblast sprayers. Three manufacturers donated a total of four garments for the study in July of 2013. Data and images from this study were analyzed and the findings presented at the IUPAC meeting in August 2014. Reports regarding the respective coverall(s) were sent to the three companies that provided the disposable garments for the study. • NY conducted an online survey with 516 male and female firefighters in the US and Canada in collaboration with International Association of Fire Chiefs, National Volunteer Fire Council, and National Association of Hispanic Firefighters. NY developed and tested an interactive website to help pesticide applicators more easily interpret PPE statements on pesticide labels.
Objective 2: Assess and improve protection and human factor performance of PPE and protective clothing (including hand, foot, and headwear) through research and product development: A. assessment of HF variables in protective clothing. B. design research and development in domain areas of fire protection, chemical protection, and medical environments.
• CO determined the impacts of poor fit of female firefighters’ protective clothing on mobility and firefighting task performance, relative to male counterparts. Joint angles at the waist, knee, and ankle were measured to evaluate the range of motion (ROM), while wearing protective pants. Data demonstrated narrower ROMs in female firefighters than male firefighters, indicating poorer mobility that female firefighters experience. • MN conducted an experimental evaluation of 4 approaches to transporting and containing body moisture in microgravity environments aboard a simulated microgravity flight. These methods are aimed at reducing the effects of sustained exposure to hand sweat in the EVA space suit. • A clinical evaluation of a re-designed patient gown was conducted in two clinical settings by patients and clinicians in MN. We found an improvement in psycho-social and physical comfort for patients in the new gown. For clinicians, the design needs improvement in specific areas related to body access. A second design iteration has been completed and a re-evaluation is underway. • NY conducted a series of human performance test with 12 firefighters to identify the impact of design features of firefighters’ PPE. NY is conducting a fit test of firefighter gloves. Firefighters don the best fitting glove from the size range in each style and assess the fit of the glove. Firefighter hands without gloves, and in the two styles of gloves, (plus the firefighter’s current glove style when available) are scanned, and scans have been merged for analysis. Thirty-three firefighters have participated in the study to date, of whom 15% were women. Further testing, hand measurements from the scans, and analysis is underway. • NY is also conducting a fit test of three disposable coverall styles for pesticide protection, two commercial styles and one developed by the research team based on data collected from agricultural workers. Study participants don coveralls, gloves and footwear, and assess comfort and ease of movement with a series of 4 range-of-movement body positions. 3D body scans are taken of each coverall and each position. Data have been collected on 43 participants (30 female, 13 male; 18 to 40 years old, mean age 22. Recruitment efforts for continuation of this data collection are focused on males in larger sizes.
Objective 3: Develop research-based performance guidelines and standards for personal protective equipment and protective clothing: A. establish performance guidelines and/or standards for domain areas of fire protective footwear and glove protection for pesticide handlers B. establish sizing and fit guidelines for fire protective equipment.
• A collaborative project was initiated by MD in 2012 to develop methodology to measure pesticide permeation through glove materials. A new cell was designed with input from colleagues in the United Kingdom. This cell was used to measure the permeation of active ingredients in pesticides through garment and glove materials. Tests were conducted at São Paulo State University – Jaboticabal as part of the MOU with UMES. Two proposed standards are an outcome of the collaborative research on the permeation test. Drafts for the following work items were developed by MD in consultation with experts from several countries. o ISO/PWI 18889 "Protective gloves for pesticide operators - Performance requirements" is being balloted as a new project. o ISO/PWI 19918 "Protective clothing — Protection against liquid chemicals — Measurement of cumulative permeation of chemicals with low vapour pressure through protective clothing and glove materials" is being balloted as a new project. • A study was conducted to compare pressure penetration and permeation through multicomponent materials used for Personal Protective Equipment (PPE). The permeation and pressure penetration data were used as the basis for proposing replacement of the pressure penetration test with the permeation test in the ISO 27065 draft. • As Project Leader for International Standards Organization (ISO) Standards on Protective Clothing for Pesticide Operators, the Project Investigator for Maryland worked closely with the European Committee for Standardization (CEN) WG3 members to address comments submitted by CEN members regarding ISO 27065 "Protective clothing -- Performance requirements for protective clothing worn by operators applying liquid pesticides." CEN/TC 162 has approved activation of the Work Item for revision of the standard as an ISO/EN standard with ISO lead. • NY is working with International Personnel Protection, Inc. in the development of a technology that could be utilized in the development of a new testing standard for firefighter turnout gear. A sensor garment incorporating parallel electrical conductors sewn into the fabric of a form-fitting hooded coverall to be worn on a manikin is under development. The sensor garment and manikin can be used as part of a standardized test to detect liquid that passes through a protective ensemble to test for protection from liquid challenges. Two prototypes have been developed and are being tested for reliability and durability.
Objective 4: Develop novel functionality in materials for PPE: A. Research on novel environmentally friendly materials and technologies that can provide protective functions. B. Research on novel textile-integrated sensing techniques C. evaluation of the performance of the materials for personal protective applications.
• CA has continued the development of functional materials and textiles, including photo-induced finishing treatment of fabrics, formaldehyde free wrinkle-free treatment of cotton, rechargeable biocidal polyester microfibers, and farmworker garments with reduced heat stress functions. The preparation of biocidal microfiber wipers is currently supported by Rubbermaid with intention to produce self-decontaminating wipers for healthcare and biological protections. The photo-induced surface modification treatment is using certain textile dyes as photo-initiators for radical graft polymerizations on surfaces of fibers. The environmentally friendly wrinkle free treatment of cotton is supported by Cotton Inc.. • CA has been studying farm worker clothing in order to reduce heat stress illness in California farm workers. This project has been supported by Western Center of Agricultural Health and Safety with a grant from NIOSH. The graduate student (Amy Nowicki) designed and prepared some new garments, and evaluated the wearing acceptance by a group of student farmers. In addition, CA has successfully developed high sensitivity colorimetric sensors for two popular fumigants, methyl bromide and chloropicrin, with financial support from California Department of Pesticide Regulation. • Rather than resorting to extrinsic aids, like using additional heat insulation/storage or phase change materials or surface coatings as in other current infrared camouflage technologies, a new scheme of perspiration based infrared camouflage and a corresponding multi-layer cloth prototype were proposed recently by us. In this work, several experiments were conducted on a three-layer system based on the proposed prototype, and the original theories were modified to suit the experimental system. • MN has continued our development and characterization of a novel stitched stretch and bend sensor, fabricated using an industrial coverstitch machine. MN has established a method of insulating the sensor using a fusible polymer film, which was found to reduce noise in the sensor response as well as inhibiting long-term drift during washing and drying. • MN has also begun development of an alternative technique for sensing in-plane body geometries through clothing, by using magnetic field sensors. • Work continues on developing industrial production techniques for integrating standard electronic component packages into textiles by blending technologies and techniques standard to electronic manufacture and those standard to apparel manufacture. We have experimented with two CNC-capable embroidery machines, and research into an improved stitching solution is underway. We have successfully completed surface-mount reflow soldering of simple (2-pin) and complex (8-pin SOIC) packages, and durability and washability testing is underway. • MN has also developed a single-handed typing glove for wearable text input. The glove has been pilot-tested, but thorough evaluation has not yet been completed. • A method was developed to immobilize Cu-BTC metal-organic framework (MOF-199) particles by enmeshing them in nonwoven polyacrylonitrile (PAN) nanofibers creating a fibrous membrane with the potential ability to remove chemical warfare agents or pesticides from solution. These membranes were shown to effectively adsorb methyl parathion, an organophosphate pesticide. • Based on solubility theory and experimental results, partitioning was determined to be the main mechanism of removal. After 2 hours, the PAN/MOF-199 membranes removed 88 % more methyl parathion than the unmodified PAN membranes and 62 % as much as the MOF-199 crystal powder. Since the MOF particles were enmeshed in the PAN fiber mats, the MOF particles were in a workable and flexible substrate. Potential applications of these functionalized fibrous membranes include protective clothing for agricultural workers or military personnel as well as filtration media. • Degradation of methyl parathion (MP) adsorbed in metal-organic framework (MOF)-199 cages was studied using solid-state 31P nuclear magnetic resonance (NMR), Raman spectrometry, and solvent extractions. MP degradation was confirmed to be occurring when adsorbed in CuBTC MOF (MOF-199). Over 67 days of treatment, results show that constitutional isomerization is an early mechanism of methyl parathion degradation with smaller amounts of oxidation (methyl paraoxon) and direct hydrolysis of MP followed by hydrolysis of these early degradation products. Raman spectrometry after 5 days and water extractions after 5 and 35 days supported this conclusion. 4-nitrophenyl, a common MP degradation product, was observed with the amount increasing with exposure time or higher MP loading. Degradation of organic compounds such as methyl parathion, in addition to the selective physisorption, demonstrates the usefulness of MOF-199 for potential applications in protective materials for occupational and military protective clothing. • A method to create fluorescent metal-organic frameworks using rare earths was developed and it is being optimized to use these materials as sensors for detection of leaks of methane and other toxic and flammable gases. These new frameworks can be used in protective clothing and flexible sensors inside mines and other buildings where natural gas may be present. • The antibacterial properties of MOF-199 were studied and found to be highly effective. These discoveries are of great importance as it is possible to tailor MOF-199 to capture gases, work as a sensor as well as antibacterial agent in a true multifunctional capability. • An improved method using covalent bonding has been developed to graft POM onto cotton and electrospun cellulose acetate nanofibrous membranes. Experiments have also been conducted using an electro-static method to graft POM on these membranes. It has been determined that higher loads of POM particles can be grafted on cellulosic materials (whether covalent or electrostatic methods are used). Polycotton samples enable only small/limited amounts of POM particle grafting (whether covalent or electrostatic methods are used.) Higher surface area substrates enable the highest amount of POM grafting. Higher loads of POM on these substrates correspond to higher amounts of methyl parathion decontamination. Further analysis is being conducted to determine which grafting method gave the optimal decontamination results (highest decon to POM loading ratios).
Impacts
- The rechargeable biocidal microfiber wipers and mops could potentially improve prevention of transmission of infectious diseases. The work on farmworker clothing supported by Western Center of Agricultural Health and Safety (NIOSH) revealed that by using simple optimization process and improved design, the new farm worker garments could provide reduced heat stresses. The work in the area of fumigant sensors supported by California Department of Pesticide Regulation could significantly improve sensitivity of detection limits on these fumigants at very low prices and could potentially improve health and safety of farmworkers or residents living close to crop fields.
- The experimental results compared well with the theoretical predictions in verifying the principle of proposed perspiration based infrared camouflage, and in examining the effects of such factors as layer thickness and layer sequence. More importantly, through a heat flux analysis, it was found that the ratio of the latent heat flux to the sensible heat flux (ql/qs) can be used as a general criterion in designing the comfort performance of a cloth system. For the perspiration based infrared camouflage: the higher the ratio, the better the infrared camouflage effect.
- HI developing low-cost body scanning methods with Kinect to personal avatar and facilitate fabric simulation
- An evaluation protocol for footwear fit and comfort was developed and its validity was evaluated. The protocol adopted both subjective and objective evaluation methods, and data were collected from 3D scanning and participant surveys
- Low-cost, comfortable body sensing methods were developed to facilitate pervasive field applications of ergonomic monitoring for manual laborers.
- Development of permeation cell provides a relatively simple method to measure permeation of active ingredient of pesticide through garment and glove materials.
- Data and comments have been submitted to EPA docket for consideration in revising the Worker Protection Standard. The performance requirement standard for protective clothing and gloves can be used to quantify and thus define chemical resistance of materials against pesticides.
- Microdenier, electrospun webs and self-decontaminating materials were developed to increase chemical protection. These finding are useful in improving product development to enhance health and safety of the population.
- Gender specific fit issues, size issues and compatibility issues of firefighters? equipment designs were addressed. Suggestions for improved design were made based on online survey and focus group interview. Biomechanic data indicating the impact of flexibility of firefighters? boot and weight of PPE on their body balance and mobility will provide practical implications to improve designs.
- Early analysis of firefighter glove fit suggests that the crotch alignment and length of the thumb of the glove are not well proportioned for the majority of firefighters.
- Early analysis of coverall fit suggests that the coverall developed by the research team can be sized smaller and closer to the body and still have good range of motion.