TY - JOUR
T1 - Glass transition behavior and miscibility in blends of poly(vinyl p-phenol) with two homologous aliphatic polyesters
AU - Woo, E. M.
AU - Chiang, Chih Pei
N1 - Funding Information:
The support of this work by the Taiwan's National Science Council (#NSC 91 2216 E 006 021) is gratefully acknowledged.
PY - 2004/11
Y1 - 2004/11
N2 - New miscible blend systems comprised of poly(4-vinyl phenol) (PVPh) and a homologous series of polyesters of different CH2/CO ratios (from 4.5 to 7) was discovered. Miscibility has been confirmed using differential scanning calorimetry, Fourier-transformed infrared spectroscopy, and scanning electron microscopy. The PVPh/polyesters blends investigated exhibited a single composition-dependent glass transition and homogeneous phase morphology, and they similarly exhibited a cusp in the Tg-composition relationships. This work further extended the range of aliphatic polyesters that are known to be miscible with PVPh. The Flory-Huggins interaction parameter (χ12) or energy density (B) obtained from analysis of melting point depression for PVPh/PEAz and PVPh/PHS blends are of negative values. More interestingly, the specific interactions in the PVPh/polyester blends change with the corresponding different structures in the polyester component. For the PVPh/PHS blend whose polyester constituent possesses a lower carbonyl density in the main chain (average CH2/CO ratio=7), the energy density B was found to be -1.17 cal cm-3. This value is significantly lower than those for either the PVPh/PEAz (CH2/CO=4.5) blend system (B=-7.72 cal cm-3). Miscibility, specific interactions, and peculiar T g-composition relationships in the blends of PVPh with selected homologous polyesters are discussed.
AB - New miscible blend systems comprised of poly(4-vinyl phenol) (PVPh) and a homologous series of polyesters of different CH2/CO ratios (from 4.5 to 7) was discovered. Miscibility has been confirmed using differential scanning calorimetry, Fourier-transformed infrared spectroscopy, and scanning electron microscopy. The PVPh/polyesters blends investigated exhibited a single composition-dependent glass transition and homogeneous phase morphology, and they similarly exhibited a cusp in the Tg-composition relationships. This work further extended the range of aliphatic polyesters that are known to be miscible with PVPh. The Flory-Huggins interaction parameter (χ12) or energy density (B) obtained from analysis of melting point depression for PVPh/PEAz and PVPh/PHS blends are of negative values. More interestingly, the specific interactions in the PVPh/polyester blends change with the corresponding different structures in the polyester component. For the PVPh/PHS blend whose polyester constituent possesses a lower carbonyl density in the main chain (average CH2/CO ratio=7), the energy density B was found to be -1.17 cal cm-3. This value is significantly lower than those for either the PVPh/PEAz (CH2/CO=4.5) blend system (B=-7.72 cal cm-3). Miscibility, specific interactions, and peculiar T g-composition relationships in the blends of PVPh with selected homologous polyesters are discussed.
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U2 - 10.1016/j.polymer.2004.10.011
DO - 10.1016/j.polymer.2004.10.011
M3 - Article
AN - SCOPUS:8844243267
SN - 0032-3861
VL - 45
SP - 8415
EP - 8424
JO - polymer
JF - polymer
IS - 25
ER -