摘要
以大豆油，邻苯二甲酸二丁酯（DBP）为混合稀释剂，采用热致相分离法（TIPS）制备聚丙烯（PP）微孔膜．研究了纳米碳酸钙成核剂、纳米碳酸钙／庚二酸复合成核剂对PP／大豆油／DBP（30／42／28，质量比）混合体系中PP结晶、熔融性能和PP微孔膜微观结构的影响．结果表明，单-纳米碳酸钙成核剂加入量为PP的0％-4％（质量百分率）时，PP／DBP／大豆油体系中PP熔融曲线上对应的峰值温度（Tm^p）降到150．7-151．3℃，而纯PP的熔融峰值温度为165℃；DSC实验结果还显示加入1％-4％纳米碳酸钙和0．5％庚二酸后，导致PP的熔融曲线上出现了熔融双峰，说明纳米碳酸钙，庚二酸复合成核剂与单一成核剂相比有明显地促进β晶生成的作用，宽角X射线衍射（WAXD）实验进一步证实了β晶的存在．单一纳米碳酸钙成核剂对PP微孔膜的球晶结构和微观孔结构影响不大；加入纳米碳酸钙，庚二酸复合成核剂明显影响PP微孔膜的球晶结构和微观孔结构，其中0．5％庚二酸和1％纳米碳酸钙组成的复合成核剂制得的PP微孔膜的球晶结构明显，微孔膜孔径小且分布均匀；进一步增加纳米碳酸钙用量，PP微孔膜生成了许多细小的边界模糊的不规则结晶，微孔膜孔径不规则且尺寸较大，这与此时PP形成β晶结构有关．
Polypropylene （PP） microporous membranes were prepared with and di-n-butyl-phthalate （DBP） via thermally induced phase separation the composite diluents of soybean oil （ TIPS ）. The effects of nano-CaCO3 nucleating agent and nano-CaCO3/pimelic acid bicomponent nucleating agent on the crystalline morphology and melting behaviors of the PP/soybean oil/DBP system, and on the microstructure of PP membrane were investigated The experimental results showed that with addition of 0% - 4% single nano-CaCO3 nucleating agent the peak temperature of melting curve of PP in PP/soybean oil/DBP system varied from 150.7 ℃ to 151.3℃, while the peak melting temperature of pure PP is 165 ℃. The differential scanning calorimetry （DSC） showed that the addition of bicomponent nucleating agent nano-CaCO3 （1% - 4% ） and pimelic acid （0.5 % ） induced two peaks on the melting curve. Wide-angle X-ray diffraction （WAXD） measurements proved that PP formed β phase and α-phase with addition of bicomponent nucleating agent nano-CaCO3 （1%- 4% ） and pimelic acid （0.5 % ）, while the addition of single nano-CaCO3 nucleating agent resulted in only PP crystals of a-phase, which was consistent with the results of DSC. The addition of single nano-CaCO3 nucleating agent in PP/soybean oil/DBP system had unremarkable effect on the morphology of PP membrane. While nano-CaCO3/pimelic acid （ 1%/0.5 % ） bicomponent nucleating agent was used, the PP microporous membrane showed smaller and regular pores. When the nano-CaCO3/pimelic acid content was 2%/0.5 % and 4%/0.5 %, PP mieroporous membrane showed more tiny irregular spherulites, as well as larger pores, which were related to the formation of β phase.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2006年第7期866-872,共7页
Acta Polymerica Sinica
基金
国家"863"计划(项目号2002AA328020)
江苏省教育厅高校自然科学基金(基金号02KJD430005)资助项目
关键词
纳米碳酸钙
庚二酸
成核剂
热致相分离法
聚丙烯微孔膜
Nano-CaCO3, Pimclic acid, Nucleating agent, Thermally induced phase separation, Polypropylene microporous membrane
