Miscibility, Morphology and Crystallization Behavior of Poly(Butylene Succinate-co-Butylene Adipate)/Poly(Vinyl Phenol)/Poly(l-Lactic Acid) Blends
Miscibility, Morphology and Crystallization Behavior of Poly(Butylene Succinate-co-Butylene Adipate)/Poly(Vinyl Phenol)/Poly(l-Lactic Acid) Blends
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DOI：
10.3390/polym8120421
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发表时间：
2016-12
期刊：
影响因子：
5
通讯作者：
Pengfei Si;F. Luo;Fahai Luo
中科院分区：
文献类型：
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作者：
Pengfei Si;F. Luo;Fahai Luo
采用溶液浇铸法将无定形聚乙烯基苯酚（PVPh）引入到聚丁二酸丁二醇酯-共-己二酸丁二醇酯/聚乳酸（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。PBSA和PLLA之间的相容性随着PVPh掺入而改善，如通过接近两种组分的Tg所证明的。当PVPh含量达到高达50重量%时，共混物样品仅表现出一个Tg，这意味着PBSA和PLLA之间的完全相容性。通过扫描电镜（SEM）进一步证实了PBSA/PLLA共混物的增溶效果。对于含有5wt%PVPh及以上的共混物样品，PBSA/PLLA共混物的典型的“see岛”相分离结构转变为均相结构。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下降趋势。共混物中PBSA的等温结晶速率随PVPh的加入而明显降低，而PLLA的等温结晶速率随PVPh的加入而略有增加。广角X射线衍射（WAXD）分析表明，PLLA在共混物样品保持部分结晶，而PBSA变成无定形状态与PVPh含量的增加。
Amorphous poly(vinyl phenol) (PVPh) is introduced into poly(butylene succinate-co-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 Tgs of the two components. When PVPh content reaches up to 50 wt %, the blend sample exhibits only one Tg, 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.