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Phase separation of impact‐modified PVC/PMMA blends under melt‐blending conditions
Author(s) -
Zhou Chao,
Gao Yunxia,
Qi Xiaoxue,
Tan Zhiyong,
Sun Shulin,
Zhang Huixuan
Publication year - 2013
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.20325
Subject(s) - materials science , miscibility , composite material , toughness , polymer blend , izod impact strength test , natural rubber , methyl methacrylate , phase (matter) , polymer , copolymer , ultimate tensile strength , chemistry , organic chemistry
Poly (vinyl chlride)/Poly (methyl methacrylate) ( PVC/PMMA ) blends were prepared by melt blending at 160°C and 190°C over an entire composition range. The miscibility of the blends was characterized by dynamic mechanical thermal analysis, transmission electron microscopy, and light transmittance testing. The blends prepared at 160°C were homogeneous on our observed scale, while the blends prepared at 190°C clearly showed phase separation. The stress‐strain behaviors of the blends prepared at 160°C were investigated. The results showed that the toughness of the blends could be improved by an increase of PVC content, resulting effectively in a removal of intrinsic strain softening, a decrease in yield stress, and an increase in strain hardening. Furthermore, a core‐shell structured modifier was introduced into the PVC/PMMA blends, and the impact property of the blends was studied. The results showed that the addition of rubber particles could improve the toughness of the two series of blends. However, the blends prepared at 190°C had higher impact strengths than those prepared at 160°C, a result which may be attributed to phase separation. J. VINYL ADDIT. TECHNOL., 19:11–17, 2013. © 2013 Society of Plastics Engineers