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

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dc.contributor.advisorPark, OOk-
dc.contributor.advisor박오옥-
dc.contributor.authorNam, Byung Kook-
dc.contributor.author남병국-
dc.date.accessioned2017-03-29T02:45:28Z-
dc.date.available2017-03-29T02:45:28Z-
dc.date.issued2016-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663116&flag=dissertationen_US
dc.identifier.urihttp://hdl.handle.net/10203/222151-
dc.description학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2016.8 ,[81 p. :]-
dc.description.abstractHigh-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.-
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectpolypropylene-
dc.subjectatactic polypropylene-
dc.subjectIzod impact strength-
dc.subjectpolymer blend-
dc.subjectnon isothermal crystallization-
dc.subject폴리프로필렌-
dc.subject어택틱폴리프로필렌-
dc.subject충격강도-
dc.subject고분자블렌드-
dc.subject비등온결정화-
dc.titleA study on isotactic polypropylene/atactic polypropylene blends = 아이소택틱 폴리프로필렌/어택틱 폴리프로필렌 혼합물에 관한 연구-
dc.typeThesis(Ph.D)-
dc.identifier.CNRN325007-
dc.description.department한국과학기술원 :생명화학공학과,-
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CBE-Theses_Ph.D.(박사논문)
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