Study on the effects of compatibilizers and processing temperature on the weld line characteristics of PC/ABS blends = PC/ABS 블렌드의 웰드라인 특성에 미치는 상용화제와 성형온도의 영향에 관한 연구

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The relatively favorable interaction between polycarbonate (PC) and styrene-acrylonitrile (SAN) copolymer matrix of acrylonitrile-butadiene-styrene (ABS) copolymer apparently makes it possible to produce commercially useful materials without any compatibilizer. However, these uncompatibilized PC/ABS blends undergo significant dispersed phase particle coalescence in the melt state under certain molding conditions, and this leads to a significant deterioration of the properties of the blend, especially at the weld line. It is generally known that stabilization of the domain morphology would be beneficial to weld line strength. However, it appears that there was little study on the effects of the processing conditions and the compatibilizers on the morphology and the mechanical properties of the welded regions of immiscible or partially miscible polymer blend. In this study, the effects of increasing the viscosity of dispersed domain and incorporating reactive and non-reactive compatibilizers on the morphology and the mechanical properties at the weld line of PC/ABS = 64/40 (wt/wt) blends were investigated The influences of processing temperature (240~280℃) were also studied. In Chapter 2, the influence of incorporating high molecular weight SAN on the weld line characteristics of PC/ABS blends, i.e., PC/g-ABS/SAN blends, was studied. Well dispersed ABS domain just at the weld line below V-notch and coarse morphology at the region behind the weld line were observed in the PC/ABS. When tensile stress was applied perpendicular to the weld line, the fracture, initiated from the V-notch at the surface, propagated along the weak region behind the weld part where domain phase coalescence was significant due to the poor compatibility between PC and SAN. It was also found that domain morphology near the weld line became stable with increasing the molecular weight of SAN in ABS domain phase. Therefore, mechanical strength of the sample with weld line also increased. Phase ...
Advisors
Park, Jung-Kiresearcher박정기researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
240696/325007  / 000985832
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2004.8, [ xv, 144 p. ]

Keywords

POLYMER BLEND; COMPATIBILIZER; WELD LINE; PC/ABSOR SYSTEM PROCESS DEVELOPMENT CHO CELLOCONTACT PRINTINGATION; CHO 세포영돈프린팅; PC/ABS; 고분자 블랜드; 상용화제; 웰드라인

URI
http://hdl.handle.net/10203/28942
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=240696&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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