A study on isotactic polypropylene/atactic polypropylene blends = 아이소택틱 폴리프로필렌/어택틱 폴리프로필렌 혼합물에 관한 연구

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High-molecular-weight atactic polypropylene (HMW-aPP) was used as the impact modifier in isotactic polypropylene (iPP). HMW-aPP (Mw 315,000 g/mol) was made by using metallocene catalysts, and iPP/HMW-aPP blends were prepared in a twin-screw extruder. The effects of HMW-aPP on the crystalline morphology, and thermal and mechanical properties of iPP were investigated by polarizing microscopy, differential scanning calorimetry, a universal testing machine, and Izod impact tests. The crystallization temperature and crystallinity of the iPP/HMWaPP blends increased compared to that of pure iPP. The HMW-aPP acted as a diluent during the crystallization of the iPP/HMW-aPP blends. These diluent HMW-aPP molecules prevented entanglement of the iPP molecules, which facilitated the crystallization of iPP. The Izod impact strength of the iPP/HMW-aPP blends increased with increasing HMW-aPP content owing to the incorporation of the soft HMW-aPP into the hard iPP. The Izod impact strength of the iPP-80 blend dramatically increased by 680% compared to that of neat iPP.
Advisors
Park, OOkresearcher박오옥researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2016.8 ,[81 p. :]

Keywords

polypropylene; atactic polypropylene; Izod impact strength; polymer blend; non isothermal crystallization; 폴리프로필렌; 어택틱폴리프로필렌; 충격강도; 고분자블렌드; 비등온결정화

URI
http://hdl.handle.net/10203/222151
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663116&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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