Macromolecular Research, Vol.18, No.2, 144-152, February, 2010
Fabrication, Structures and Properties of Acrylonitrile/Vinyl Acetate Copolymers and Copolymers Containing Microencapsulated Phase Change Materials
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Acrylonitrile(AN)-Vinyl acetate (VAc) copolymers (AN/VAc) were synthesized by redox polymerization and microencapsulated phase change materials (MicroPCMs) were incorporated at the polymerization step. The effect of VAc monomers and/or the MicroPCMs on composition, melting point (T-m), exothermic peak value (T-d), average molecular weight (M-eta), crystallinity of the copolymers were examined by Fourier Transform Infrared Spectroscopy ( FTIR), Elementary Analysis, Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TG), Ubbelohde viscosimeter and X-ray Diffraction (XRD). The compositions of the AN/VAc agreed well with the feed ratios. The melting peak shifted to a lower temperature (267 degrees C) with increasing concentration of VAc monomers and/or MicroPCMs, while the exothermic peak shifted to the higher temperature (324 degrees C). The average molecular weight of the copolymer was approximately 31,000. The crystallinity of the copolymers decreased with increasing content of VAc monomers and/or MicroPCMs.
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