MSGID: 1:317/3 6440c03e   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    Stab-resistant fabric gains strength from carbon nanotubes, polyacrylate   
      
      
     Date:   
         April 19, 2023   
     Source:   
         American Chemical Society   
     Summary:   
         Fabrics that resist knife cuts can help prevent injuries and   
         save lives.   
      
         But a sharp enough knife or a very forceful jab can get through   
         some of these materials. Now, researchers report that carbon   
         nanotubes and polyacrylate strengthen conventional aramid   
         to produce lightweight, soft fabrics that provide better   
         protection. Applications include anti- stabbing clothing, helmets   
         and insoles, as well as cut-resistant packaging.   
      
      
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   FULL STORY   
   ==========================================================================   
   Fabrics that resist knife cuts can help prevent injuries and save   
   lives. But a sharp enough knife or a very forceful jab can get through   
   some of these materials. Now, researchers report in ACS Applied Nano   
   Materialsthat carbon nanotubes and polyacrylate strengthen conventional   
   aramid to produce lightweight, soft fabrics that provide better   
   protection. Applications include anti-stabbing clothing, helmets and   
   insoles, as well as cut-resistant packaging.   
      
      
   ==========================================================================   
   Soft body armor is typically made from aramid, ultra-high-molecular-weight   
   polyethylene, or carbon and glass fabrics. Their puncture resistance   
   depends, in part, on the friction between yarn fibers within   
   these materials. Up to a point, greater friction means greater   
   protection. Manufacturers can boost friction by roughening the fiber   
   surfaces, but that requires a complicated process, and product yield   
   is low. Alternatively, the bonding force between yarns can be enhanced   
   by adding another component, such as a sheer thickening fluid (STF)   
   or a polyurethane (PU) coating. But these composite fabrics can't   
   simultaneously satisfy the requirements for thinness, flexibility and   
   light weight. Ting-Ting Li, Xing-xiang Zhang and colleagues wanted to   
   find another way to improve performance while satisfying these criteria.   
      
   The researchers tested a polyacrylate emulsion (PAE), STF and PU as   
   coatings on aramid fabric. In simulated stabbing tests, aramid fabric   
   coated with PAE outperformed the uncoated material used by itself   
   or in combination with STF or PU. Carbon nanotubes are known to make   
   composites tougher, and adding them to aramid/PAE further improved impact   
   resistance. The team says that's because the nanotubes created bridges   
   between the fibers, thereby increasing friction. The nanotubes also formed   
   a thin, protective network that dispersed stress away from the point   
   of impact and helped prevent fiber disintegration. The new lightweight,   
   flexible, puncture-resistant composite fabric could be useful in military   
   and civilian applications, according to the researchers.   
      
       * RELATED_TOPICS   
             o Matter_&_Energy   
                   # Wearable_Technology # Graphene # Nanotechnology   
                   # Textiles_and_Clothing # Civil_Engineering #   
                   Materials_Science # Engineering_and_Construction #   
                   Construction   
       * RELATED_TERMS   
             o Carbon_nanotube o Fullerene o Materials_science o   
             Nanotechnology o Solar_power o Carbon-14 o Silicone o Lead   
      
   ==========================================================================   
   Story Source: Materials provided by American_Chemical_Society. Note:   
   Content may be edited for style and length.   
      
      
   ==========================================================================   
   Journal Reference:   
      1. Wen-hua Cai, Ting-ting Li, Xing-xiang Zhang. Polyacrylate and   
      Carboxylic   
         Multi-Walled Carbon Nanotube-Strengthened Aramid Fabrics   
         as Flexible Puncture-Resistant Composites for Anti-Stabbing   
         Applications. ACS Applied Nano Materials, 2023; 6 (7): 6334 DOI:   
         10.1021/acsanm.3c00738   
   ==========================================================================   
      
   Link to news story:   
   https://www.sciencedaily.com/releases/2023/04/230419125110.htm   
      
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