Miscibility and crystallization behaviour of poly(l-lactide)/poly(p-vinylphenol) blends
Miscibility and crystallization behaviour of poly(l-lactide)/poly(p-vinylphenol) blends
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DOI：
10.1016/s0032-3861(97)10167-7
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发表时间：
1998-09
期刊：
影响因子：
4.6
通讯作者：
Lianlai Zhang;S. Goh;S. Lee
中科院分区：
文献类型：
--
作者：
Lianlai Zhang;S. Goh;S. Lee
The miscibility of poly(l-lactide) (PLLA)/poly(p-vinylphenol) (PVPh) blends has been studied by differential scanning calorimetry (d.s.c.) and Fourier transform infrared (FTi.r.) spectroscopy. PLLA/PVPh blends are partially miscible as characterized by shifts in the glass transition temperatures (Tgs) of the two component polymers. The Tgof the PLLA-rich phase increases with increasing PVPh content, while that of the PVPh-rich phase decreases with increasing PLLA content. The apparent melting temperature of PLLA is significantly depressed with increasing PVPh content. Weak hydrogen-bonding interaction exists between the carbonyl groups of PLLA and the hydroxyl groups of PVPh as evidenced in the FTi.r. spectra. In the amorphous state, the hydrogen-bonded hydroxyl band of PVPh shifts to a higher frequency upon blending with PLLA, while the carbonyl stretching band of PLLA shifts to a lower frequency with the addition of PVPh. In addition, a new carbonyl stretching band attributed to the hydrogen-bonded carbonyl groups of PLLA is found at 1700 cm−1. The crystallinity of PLLA in the blends displays a marked decrease with increasing PVPh content. When the PVPh content is above 40 wt%, crystallization of PLLA does not occur under isothermal conditions. Moreover, the cold crystallization process of the PLLA component is also affected significantly by the addition of PVPh.
