【摘要】 为开发高黑度的细原液着色聚酯纤维,采用原位法连续聚合制备出炭黑质量分数为2%～3%的聚酯/炭黑(简称原位法PET/炭黑)体系,对其流变行为、结晶行为和炭黑分散形态等进行了表征,并制备了高速纺长丝。结果表明:原位法连续聚合使炭黑以直径小于1μm的粒子簇团形式均匀分散在聚酯基体中;炭黑含量较低时的流变行为与PET相似,当炭黑质量分数达到3%时,原位法PET/炭黑熔体的表观黏度随剪切速率增大而快速降低;熔融结晶过程中,炭黑作为高效异相成核剂,显著加快了聚酯结晶速率,同时,聚酯与炭黑的良好相互作用,导致有更多的结晶缺陷,与PET相比,出现了熔融双峰,且高温熔融峰峰顶温、结晶度均降低,这与母粒法PET/炭黑体系明显不同。因为原位法保证了良好的炭黑分散性,原位法PET/炭黑可以稳定制备出炭黑质量分数为3%、单丝线密度为0.52 dtex、断裂强度≥3.31 c N/dtex的长丝。更多还原

【Abstract】 In order to develop dope-dyed polyester fiber with high blackness and fine denier,polyester( PET)/carbon black system with carbon black content of 2% to 3% was prepared by in-situ continuous polymerization. The rheology behavior,crystallization behavior and carbon black dispersion morphology of the in-situ polymerized PET/carbon black system were characterized,and polymerized PET/carbon black filaments were prepared by high speed spinning. The results show that carbon black is uniformly dispersed in polyester matrix in the form of particle clusters less than 1 μm in diameter. The rheological behavior of the in-situ polymerized PET/carbon black with low carbon black content is similar to that of PET. When the carbon black content reaches 3%,the apparent viscosity of in-situ polymerized PET/carbon black melt decreases rapidly with the increase of shear rate. During melt crystallization of the polymerized PET/carbon black,carbon black,as a high efficient heterogeneous nucleating agent,significantly speeds up the crystallization rate of polyester,at the same time,and the good interaction between polyester and carbon black leads to more crystallization defects. These results lead to the double melting peaks of the polymerized PET/carbon black system, and the crystallinity and the peak temperature of the melting peak of polymerized PET/carbon black are lower than that of PET,which is obviously different from that of PET/carbon black prepared by masterbatch method. Due to the good dispersion of carbon black,the polymerized PET/carbon black with 3% carbon black content can be successfully spun into filaments,with the monofilament size 0. 52 dtex and breaking strength higher than 3. 3 c N/dtex.更多还原