Open AccessMiscibility and Phase Behavior in Blends of Poly(vinyl butyral) and Poly(methyl methacrylate)
Author(s) -
Wenjie Chen,
D. J. David,
William J. MacKnight,
Frank E. Karasz
Publication year - 2001
Publication title -
macromolecules
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.994
H-Index - 313
eISSN - 1520-5835
pISSN - 0024-9297
DOI - 10.1021/ma010072q
Subject(s) - miscibility , copolymer , materials science , methyl methacrylate , polymer chemistry , phase (matter) , poly(methyl methacrylate) , dynamic mechanical analysis , polymer blend , lower critical solution temperature , upper critical solution temperature , flory–huggins solution theory , chemical engineering , composite material , polymer , chemistry , organic chemistry , engineering
The miscibility and phase behavior in blends of poly(vinyl butyral) (PVB) and atactic poly(methyl methacrylate) (PMMA) were studied by dynamical mechanical thermal analysis (DMTA) and optical microscopy (OM). PVB is regarded as a random copolymer containing vinyl butyral (VB) and vinyl alcohol (VA) units. In this study the copolymer composition was varied over a wide range, and PMMA was varied with respect to molecular weight. DMTA measurements show two distinct Tg's for the blends of all PVBs with PMMAs of high molecular weights (Mw = 1.2 × 105 and 1.5 × 104), indicating completely immiscibility. However, OM observations show that the size of phase-separated domains of PVB blends with PMMA (Mw = 1.2 × 105) depends on copolymer composition and displays a minimum in the range 22−33 wt % VA content. For low molecular weight PMMAs (Mw = 2 × 103 to 5 × 103), miscibility with UCST-type phase behavior was observed in certain blends, the miscibility range depending on the copolymer composition and the molecular ...
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