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Morphology and thermal properties of two polymethacrylates modified by a polymer liquid crystal

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We have studied blends of a polymer liquid crystal (PLC) with poly(cyclohexylethyl methacrylate) (PCHEMA) or poly(cyclohexylpropyl methacrylate) (PCHPMA). The PLC is PET/0.6PHB where PET = poly(ethylene terephthalate), PHB = p‐hydroxybenzoic acid and 0.6 is the mole fraction of the latter in the copolymer. The microstructure was studied by scanning electron microscopy (SEM). PCHEMA + PLC (20 wt% of the latter, blend E) has a fine texture with LC islands evenly distributed in the matrix and good adhesion between the phases resulting from their partial miscibility. The PCHPMA + PLC (20 wt% of the latter, blend P) shows only limited compatibility. The SEM results are confirmed by values of the glass transition temperatures T g determined via thermal mechanical analysis. The T g value of the blend E is shifted towards the T g of PLC; T g of blend P is practically equal to that of PCHPMA. The linear isobaric expansivity αL values for both blends are lower than the respective values for pure PCHPMA and PCHEMA. Thermal stabilities of the blends determined by thermogravimetry are also better than those of pure polymethacrylates. The temperature of 50% weight degradation for blend E is higher than that for pure PCHEMA by more than 60 K Copyright © 2004 Society of Chemical Industry
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Keywords: morphology; poly(cyclohexylethyl methacrylate); poly(cyclohexylpropyl methacrylate); polymer blends; polymer liquid crystals; thermal expansivity; thermal stability

Document Type: Research Article

Affiliations: 1: Laboratory of Advanced Polymers and Optimized Materials (LAPOM), Department of Materials Science and Engineering, University of North Texas, PO Box 305310, Denton, TX 76203-5310, USA 2: Department of Physical Chemistry, Pontifical Catholic University of Chile, Casilla 306, Santiago 22, Chile

Publication date: April 1, 2004

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