CAJ | 학술논문

利用乙烯基聚二甲基硅氧烷/苯乙烯接枝型长支链聚丙烯(PP-g-VS/St)在剪切和快速降温过程中可以诱导形成 β 晶聚丙烯这一优势,研究了 PP-g-VS/St 在注塑加工过程中作为高分子 β 晶成核剂对等规聚丙烯(iPP)结晶温度、晶体结构及力学性能的影响.结果表明改性聚丙烯的结晶温度、β 晶相对含量和力学性能随着 PP-g-VS/St添加量的增加而增加.当 PP-g-VS/St 的添加量为 50%(质量分数)时,改性聚丙烯的结晶温度相对于纯 iPP 提高约 10℃,β 晶相对含量达 32.8%,冲击强度、弯曲模量和拉伸强度分别相对于纯 iPP 提高了 355.3%、53.8%和 15.9%.这些结果为聚丙烯高分子 β 晶型成核剂的设计提供了新思路.
이용을희기취이갑기규양완/분을희접지형장지련취병희(PP-g-VS/St)재전절화쾌속강온과정중가이유도형성 β 정취병희저일우세,연구료 PP-g-VS/St 재주소가공과정중작위고분자 β 정성핵제대등규취병희(iPP)결정온도、정체결구급역학성능적영향.결과표명개성취병희적결정온도、β 정상대함량화역학성능수착 PP-g-VS/St첨가량적증가이증가.당 PP-g-VS/St 적첨가량위 50%(질량분수)시,개성취병희적결정온도상대우순 iPP 제고약 10℃,β 정상대함량체 32.8%,충격강도、만곡모량화랍신강도분별상대우순 iPP 제고료 355.3%、53.8%화 15.9%.저사결과위취병희고분자 β 정형성핵제적설계제공료신사로.
Taking advantages of long chain branching polypropylene based on grafting vinyl polydimethylsiloxane/styrene (PP-g-VS/St) can generate β-crystal polypropylene under shear and high cooling rate condition, PP-g-VS/St was used as a polymeric β-nucleating agent for isotactic polypropylene (iPP) under injection modeling processing and its effects on the crystallization temperature, crystal structure and mechanical properties of iPP were investigated. The results indicated that the crystallization temperature, β-crystal relative content and mechanical properties of modified iPP were improved as increasing the content of PP-g-VS/St. The crystallization temperature of modified iPP with 50% (mass) PP-g-VS/St increased by 10℃ compared with that of virgin iPP and the β-crystal relative content reached 32.8%. The impact strength, flexural modulus and tensile strength were enhanced by 355.3%, 53.8% and 15.9%, respectively, compared with those of virgin iPP. These results may provide a new method to design polymeric β-nucleating agent for iPP.