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首页> 外文期刊>Journal of Applied Polymer Science >Blends of Aliphatic Polyesters. IV. Morphology, Swelling Behavior, and Surface and Bulk Properties of Blends from Hydrophobic Poly(L-lactide) and Hydrophilic Poly(vinyl alcohol)
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Blends of Aliphatic Polyesters. IV. Morphology, Swelling Behavior, and Surface and Bulk Properties of Blends from Hydrophobic Poly(L-lactide) and Hydrophilic Poly(vinyl alcohol)

机译：脂肪族聚酯的混合物。 IV。疏水性聚（L-丙交酯）和亲水性聚乙烯醇的共混物的形态，溶胀行为以及表面和体积特性

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Blend films were prepared from hydrophobic poly(L-lactide) (PLLA) and hydrophilic poly(vinyl alcohol) (PVA) with different PLLA contents [XPLLA (w/w) = PLLA/(PV A + PLLA)] by solution casting and melt quenching. Their morphology; swelling behavior, and surface and bulk properties were investigated. Polarizing optical microscopy, scanning electron microscopy, differential scanning calorimetry, X.ray diffractometry , and tensile testing revealed that. PLLA and PV A were phase separated in these blend films and the PLLA-rich and PVA-rich phases both formed a continuous domain in the blend film of X_(PLLA) = 0.5. The water absorption of the blend films was higher for the blend films of low X_(PLLA) values when compared at the same immersion time, and it was larger than expected from those of nonblended PLLA and PV A films. The dynamic contact angles of the blend films were linearly increased with an increase in X_(PLLA) . The tensile strength and Youngs modulus of the dry blend films decreased with arise in X_(PLLA)' but this dependence was reversed because of the large decreases in tensile strength and Young's modulus for the blend films having high X_(PLLA) values Iafter immersion in water. The elongation at break was higher for the wet blend film than for the dry blend film when compared at the same X_(PLLA) and that of the dry and wet blen~ films decreased with an increase in X_(PLLA).
机译：通过溶液浇铸由疏水聚（L-丙交酯）（PLLA）和亲水聚（乙烯醇）（PVA）具有不同的PLLA含量[XPLLA（w / w）= PLLA /（PV A + PLLA）]制备共混膜。熔体淬火。它们的形态;研究了膨胀行为，以及表面和体积特性。偏光光学显微镜，扫描电子显微镜，差示扫描量热法，X射线衍射法和拉伸试验表明。在这些共混膜中将PLLA和PV A相分离，并且富含PLLA和PVA的相在X_（PLLA）= 0.5的共混膜中均形成了连续畴。低X_（PLLA）值的共混膜在相同的浸入时间相比时，共混膜的吸水率更高，并且比非共混PLLA和PV A膜的预期吸水率大。随着X_（PLLA）的增加，共混膜的动态接触角线性增加。干混膜的拉伸强度和杨氏模量随X_（PLLA）'的增加而降低，但这种依赖关系得到了逆转，因为具有高X_（PLLA）值I的共混膜的抗张强度和杨氏模量的下降幅度很大。水。当在相同的X_（PLLA）下进行比较时，湿混纺薄膜的断裂伸长率高于干混纺薄膜，而干混和湿混纺薄膜的断裂伸长率随X_（PLLA）的增加而降低。

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