摘要
利用纳米S iO2/EG体系的可逆凝胶特性,在聚合过程中将纳米粒子均匀分散在PET中。用热台显微镜和DSC等实验方法澄清了纳米S iO2对PET结晶行为的影响。与微米粒子不同,PET/纳米体系中的所有纳米粒子的运动是长程关联的。在降温过程中,纳米S iO2并非起成核剂作用,而是明显推迟了起始晶核的形成时间。实验显示,体系中一旦出现微晶,微晶的数目将更多,且将很快使体系中所有较小的晶粒连成一片。合适的配方可使体系中微晶很多且不出现球晶。这一现象非常有利于熔融纺丝和后加工拉伸工艺。
Nano-silica was evenly dispersed throughout PET via in-situ polymerization. By means of Hot-Stage Polarization Microscope and DSC, the influence on the crystallization of the PET/nano-SiO2 composite has been clarified. It can be found that the nano-SiO2 does not behave as the nucleating agent in PET which is mentioned in some reference. On the contrary, nano-SiO2 postpones the initiative time and decreases the initiative temperature of crystallization for 20℃ approximately. As the microcrystalline comes into being large numbers of crystalline grains connects together more quickly than that in the general PET. When the crystals in the system connect together, the crystal grain is too little to the spherical crystal appear; this phenomenon is very favor to improve on the spinnability.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2006年第4期169-171,175,共4页
Polymer Materials Science & Engineering
关键词
纳米SIO2
聚酯
微晶
纺丝性能
nano-silica ； polyester ； crystallite ； spinnability
