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首页> 外文期刊>Journal of Applied Polymer Science >Atactic Poly(methyl methacrylate) Blended with Poly(3-D(-)hydroxybutyrate): Miscibility and Mechanical Properties
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Atactic Poly(methyl methacrylate) Blended with Poly(3-D(-)hydroxybutyrate): Miscibility and Mechanical Properties

机译：无规立构聚甲基丙烯酸甲酯与聚（3-D（-）羟基丁酸酯）的混溶性和机械性能

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摘要

Atactic poly(methylmethacrylate), aPMMA, was blended with poly(3-D(-)hydroxybutyrate), PHB, up to a maximum composition of 25% of polyester, at 190degC in a Brabender-like apparatus. The resulting blends quenched from the melt to room temperature were completely amorphous, and exhibited a single glass transition using DSC and DMTA, indicating miscibility of the components for this time-temperature history. Tensile experiments showed that at room temperature the 10/90 and 20/80 PHB/aPMMA blends exhibited higher values of strain at break, and slight decreases of the modulus and stress at break compared to near aPMMA. The tensile energy at break was almost twice that of neat of aPMMA. Tensile tests were also performed at 80degC, at which point the 25/75 and 20/80 PHB/aPMMA blends are above T_g, while the 10/90 and neat aPMMA are below T_g. The stress-strain curves obtained were functions of the physical state of the amorphous phase, and also depended on the difference between the test temperatures and T_g. In particular, comparing the neat aPMMA and the blends, decreases of the modulus and stress at break and a respectable increase in the strain at break were observed in the latter. Finally, the results were commented considering the thermal degradation of PHB in the melt during the blend preparation.
机译：在类似Brabender的装置中，将无规立构的聚（甲基丙烯酸甲酯）aPMMA与聚（3-D（-）羟基丁酸酯）PHB混合，直至聚酯的最大组成为25％。从熔体骤冷至室温的所得混合物是完全无定形的，并且使用DSC和DMTA表现出单一的玻璃化转变，表明该组分在该时间-温度历史中具有可混溶性。拉伸实验表明，在室温下，与接近aPMMA相比，PHB / aPMMA 10/90和20/80共混物表现出更高的断裂应变值，并且断裂模量和应力略有下降。断裂时的拉伸能几乎是纯aPMMA的两倍。还在80℃下进行了拉伸测试，此时25/75和20/80的PHB / aPMMA共混物高于T_g，而10/90和纯aPMMA低于T_g。获得的应力-应变曲线是非晶相物理状态的函数，并且还取决于测试温度和T_g之间的差异。特别地，比较纯aPMMA和共混物，在后者中观察到模量和断裂应力的降低以及断裂应变的显着增加。最后，考虑到共混物制备过程中熔融物中PHB的热降解，对结果进行了评论。

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