Unique Crystalline Orientation of Poly[(R)-3-hydroxybutyrate]/Cellulose Propionate Blends under Uniaxial Drawing
Unique Crystalline Orientation of Poly[(R)-3-hydroxybutyrate]/Cellulose Propionate Blends under Uniaxial Drawing
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DOI：
10.1021/ma0481611
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发表时间：
2005-02
期刊：
影响因子：
5.5
通讯作者：
J. Park;Y. Doi;T. Iwata
中科院分区：
文献类型：
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作者：
J. Park;Y. Doi;T. Iwata
采用溶剂浇铸法制备了不同组成的聚[(R)-3-羟基丁酸酯](PHB)和丙酸纤维素(CP)的共混物，并通过二维广角X射线衍射(WAXD)和小角X射线散射(SAXS)研究了它们的单轴拉伸行为。尽管据报道该体系是完全混溶的，但 DSC 结果表明，共混物的玻璃化转变温度在整个组成范围内并不依赖于组成。此外，在高 CP 含量的共混物中，这些转变相当广泛，甚至是两倍。这些特征是由于混合物的两种成分之间的化学结构差异而导致不同分子运动的结果。由于CP部件的刚度和高摩擦系数引起的链滑移和颈缩的抑制，可行的最大拉伸比随着CP含量的增加而降低。单轴拉伸过程中的一个显着特征是晶体的方式...
Blends of poly[(R)-3-hydroxybutyrate] (PHB) and cellulose propionate (CP) with various compositions were prepared by the solvent-casting method, and their uniaxial drawing behavior was studied by means of two-dimensional wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). Although this system has been reported to be entirely miscible, the DSC results revealed that the glass transition temperatures of the blends were not composition-dependent in the whole composition range. Furthermore, these transitions were quite broad or even double in the blends with high CP content. These features are the result of differing molecular motions attributed to the difference in chemical structure between the two components of the blend. The feasible maximum draw ratio decreased with increasing CP content due to restraint of chain slippage and necking caused by the stiffness and high friction coefficient of the CP component. A remarkable feature during uniaxial drawing was that the manner of crysta...