Miscibility and phase behaviors in PVC / acrylate copolymer blends = PVC - 아크릴 레이트 계 공중합물 블렌드의 상용성 및 상거동 연구

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Miscibility and phase behavior in blends of poly(vinyl chloride)[PVC] with poly(methyl-co-hexyl acrylate)[MHA] or with poly(methyl-co-2 ethyl hexyl acrylate) [MEH] were studied. It was found that both blend systems, PVC/MHA and PVC/MEH, exhibited LCST behavior and had a miscibility window. By applying the mean field theory to the composition-composition diagram [C-C plots] of MHA copolymer blend system and temperature-composition diagram [T-C plots] of PVC/MHA or PVC/MEH blend system, segmental interaction parameters which represent the binary interaction between three different monomer units, were estimated. The calculated segmental interaction parameters reflect that miscibility windows observed for PVC/MHA and PVC/MEH copolymer blend systems, were attributed to the effect of repulsion between methyl acrylate and hexyl acrylate (or 2 ethyl hexyl acrylate) units within the copolymer. By using the calculated segmental interaction parameters, blend interaction parameters $\chi_{\mbox{blend}}$ for the PVC/MHA and PVC/MEH blend systems were calculated as a function of copolymer composition according to the temperature. As the temperature increased, the values of $\chi_{\mbox{blend}}$ increased and the miscible region of $\chi_{\mbox{blend}}<\chi_{\mbox{blend}}^{\mbox{crit}}$ was reduced. Above results describe the LCST behavior of these blend systems quantitatively. To investigate the effect of specific interaction on the miscibility for these blend systems, it was also attempted to describe blend interaction parameter as a function of polar group concentration in the acrylate copolymer. The blend interaction parameter values exhibited U-shape curve as a function of weight fraction of C=O groups in the copolymer, which was related to the specific interaction between the acrylate carbonyl groups and methine protons of PVC. The miscibility behavior in copolymer-copolymer blend system of poly (vinyl chloride-co-vinyl acetate) [PVC-VAc] with poly(methyl-co-hexyl acryl...
Advisors
Kim, Sung-Chulresearcher김성철researcher
Description
한국과학기술원 : 화학공학과,
Publisher
한국과학기술원
Issue Date
1991
Identifier
59801/325007 / 000865427
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학공학과, 1991, [ xi, 126 p. ]

URI
http://hdl.handle.net/10203/29145
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=59801&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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