Si Pengfei, Luo Faliang, Luo Fahai
Ministry-Province Co-Cultivated Key Laboratory Base of Natural Gas Conversion, Ningxia University, Yinchuan 750021, China.
School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China.
Polymers (Basel). 2016 Dec 6;8(12):421. doi: 10.3390/polym8120421.
Amorphous poly(vinyl phenol) (PVPh) is introduced into poly(butylene succinate--butylene adipate)/poly(l-lactic acid) (PBSA/PLLA) blends via solution casting. Fourier transform infrared spectroscopy (FTIR) analysis verifies that intermolecular hydrogen bonding formed in PBSA/PVPh/PLLA blends. The miscibility between PBSA and PLLA is improved with PVPh incorporation as evidenced by approaching s of the two components. When PVPh content reaches up to 50 wt %, the blend sample exhibits only one , meaning complete miscibility between PBSA and PLLA. The improved miscibility of PBSA/PLLA blends is further confirmed by scanning electron microscope (SEM). Typical "see-island" phase separation structure for PBSA/PLLA blend transforms into homogenous phase structure for blend samples with 5 wt % PVPh and above. Non-isothermal crystallization analysis shows that the crystallization temperature and crystallization enthalpy of PBSA decrease with PVPh addition, and those of PLLA also show a decreasing trend. Isothermal crystallization rate of PBSA in blend samples distinctly decreases with PVPh incorporation, whereas that of PLLA in blend samples increases slightly with PVPh addition. Wide angle X-ray diffraction (WAXD) analysis indicated that PLLA in blend samples remained partly crystallized, while PBSA turned into amorphous state with increasing PVPh contents.
通过溶液浇铸法将无定形聚（乙烯基苯酚）（PVPh）引入聚（丁二酸丁二醇酯-己二酸丁二醇酯）/聚（L-乳酸）（PBSA/PLLA）共混物中。傅里叶变换红外光谱（FTIR）分析证实了PBSA/PVPh/PLLA共混物中形成了分子间氢键。随着PVPh的加入，PBSA和PLLA之间的相容性得到改善，这通过两种组分的接近得以证明。当PVPh含量达到50 wt%时，共混物样品仅呈现一个峰，这意味着PBSA和PLLA之间完全相容。扫描电子显微镜（SEM）进一步证实了PBSA/PLLA共混物相容性的提高。PBSA/PLLA共混物典型的“海岛”相分离结构转变为含有5 wt%及以上PVPh的共混物样品的均相结构。非等温结晶分析表明，随着PVPh的加入，PBSA的结晶温度和结晶焓降低，PLLA的结晶温度和结晶焓也呈现下降趋势。随着PVPh的加入，共混物样品中PBSA的等温结晶速率明显降低，而共混物样品中PLLA的等温结晶速率略有增加。广角X射线衍射（WAXD）分析表明，随着PVPh含量的增加，共混物样品中的PLLA部分保持结晶状态，而PBSA转变为无定形状态。
