Preparation and Properties of PPTA Chopped Fibers/Copolymerized Modified PPTA Precipitated Fibers Composite Paper
M-phenylenediamine(MPD)with meta structure was introduced into the poly-p-phenylene terephthamide(PPTA)molecular chain via copolymerization strategy.The copolymerized modified PPTA(MPPTA)was prepared by low temperature solution copolymeriza-tion.Then MPPTA precipitated fibers(pMPPTA)were obtained by precipitation method.cPPTA/pMPPTA composite paper was prepared by combining pMPPTA with PPTA chopped fibers(cPPTA)via wet forming process.The effects of basis weight and pMPPTA dosage on the properties of cPPTA/pMPPTA composite paper were investigated.The results showed that basis weight and pMPPTA dosage had a significant influence on the microstructure of the composite paper.When the basis weight of cPPTA/pMPPTA composite paper was 90 g/m2 and the mass fraction of pMPPTA was 60%,the mechanical and dielectric properties of cPPTA/pMPPTA composite paper were significantly higher than those of PPTA original paper,and the tensile strength reached 32.27 MPa.
PPTAcopolymerization modificationprecipitation fiberschopped fiberscomposite paper
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