Microstructure of Semicrystalline Poly(l-lactide)/Poly(4-vinylphenol) Blends Evaluated from SAXS Absolute Intensity Measurement
Microstructure of Semicrystalline Poly(l-lactide)/Poly(4-vinylphenol) Blends Evaluated from SAXS Absolute Intensity Measurement
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DOI：
10.1021/ma991504o
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发表时间：
2000-06
期刊：
影响因子：
5.5
通讯作者：
Hsin‐Lung Chen;Hsing-Huang Liu;J. Lin
中科院分区：
文献类型：
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作者：
Hsin‐Lung Chen;Hsing-Huang Liu;J. Lin
采用小角X射线散射（SAXS）方法研究了聚乳酸（PLLA）/聚对乙烯基苯酚（PVPh）共混物的半结晶形态。与PVPh共混增强了与层状堆叠相关的SAXS强度。这归因于层间区域中PVPh的存在，其增强了结晶层和非晶层之间的电子密度对比度（Δη）。层间形态的定量特征是Δη的大小，Δη是从Strobl−Schneider的一维相关函数推导出来的，假设相应的两相模型。测量的Δη与通过假设完全层间掺入计算的值之间的良好一致性表明，在PLLA结晶时，几乎所有的PVPh被排出到层间区域中。
The semicrystalline morphology of melt-miscible poly(l-lactide) (PLLA)/poly(4-vinylphenol) (PVPh) blends was probed by small-angle X-ray scattering (SAXS) with the measurement of absolute intensity. Blending with PVPh enhanced the SAXS intensity associated with the lamellar stacks. This was attributed to the presence of PVPh in the interlamellar regions that enhanced the electron density contrast (Δη) between the crystalline and amorphous layers. The interlamellar morphology was quantitatively characterized by the magnitude of Δη deduced from Strobl−Schneider's one-dimensional correlation function assuming the corresponding two-phase model. Good agreement between the measured Δη and the values calculated by assuming a complete interlamellar incorporation indicated that nearly all PVPh was expelled into the interlamellar regions upon the crystallization of PLLA.