Accession Number : ADA433568


Title :   Electrospinning of Poly (MMA-CO-Maa) Copolymers And Their Layered Silicate Nanocomposites For Improved Thermal Properties


Descriptive Note : Conference paper


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING


Personal Author(s) : Wang, M ; Rutledge, G C ; Hsieh, Alex J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a433568.pdf


Report Date : Dec 2004


Pagination or Media Count : 9


Abstract : Copolymers consisting of methyl methacrylate (MMA) and methacrylic acid (MAA) and their layered silicate nanocomposites were electrospun to form fibers with diameters in the sub-micron range. The presence of MAA increased the glass transition temperature and thermal stability of the copolymers through formation of anhydrides upon heating. Dispersion of layered silicates within the nanocomposites improved the electrospinnability of the nanocomposite dispersions. Fibers of uniform diameters were obtained for the poly- (MMA-co-MAA) copolymers and their nanocomposites containing montmorillonite (MMT), while protrusions were observed on the electrospun fibers from nanocomposites containing fluorohectorite (FH). MMT is predominantly exfoliated and well distributed within the fiber and oriented along the fiber axis. The electrospinnability of copolymer solutions and nanocomposite dispersions predicted based on both rheological analyses and conductivity measurements correlates well with the experimental electrospinning observations. Char formation was observed when the MMT-containing fibers were heated above the decomposition temperature indicating the characteristics of reduced flammability and increased self-extinguishing properties.


Descriptors :   *THERMAL PROPERTIES , *COPOLYMERS , *METHACRYLATES , *NANOSTRUCTURES , FIBERS , COMPOSITE MATERIALS , ANHYDRIDES , SILICATES , GLASS TRANSITION TEMPERATURE


Subject Categories : Inorganic Chemistry
      Polymer Chemistry
      Electrical and Electronic Equipment
      Laminates and Composite Materials


Distribution Statement : APPROVED FOR PUBLIC RELEASE