PPTA短切纤维/共聚改性PPTA沉析纤维复合纸的制备及其性能研究

Preparation and Properties of PPTA Chopped Fibers/Copolymerized Modified PPTA Precipitated Fibers Composite Paper

采用共聚策略,在聚对苯二甲酰对苯二胺(PPTA)分子链中引入含有间位结构的间苯二胺(MPD),通过低温溶液缩聚,制备了共聚改性PPTA (MPPTA),利用沉析法得到MPPTA沉析纤维(pMPPTA)。将pMPPTA与PPTA短切纤维(cPPTA)混合后,通过湿法抄造和热压成形制备cPPTA/pMPPTA复合纸,探究了纸张定量及pMPPTA含量对cPPTA/pMPPTA复合纸性能的影响。结果表明,纸张定量及pMPPTA含量对复合纸微观结构影响显著。当纸张定量为90 g/m^(2)及pMPPTA质量分数为60%时,cPPTA/pMPPTA复合纸的力学性能和介电性能较PPTA原纸显著提高,拉伸强度达32.27 MPa。

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 copolymerization.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/m^(2) 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.