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Miscible blends of biobased poly(lactide) with poly(methyl methacrylate): Effects of chopped glass fiber incorporation

机译:生物化聚(丙交酯)与聚(甲基丙烯酸甲酯)的混溶混合物:短切玻璃纤维掺入的影响

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摘要

Poly(lactide) (PLA) and poly(methyl methacrylate) (PMMA) are melt compounded with chopped glass fiber using laboratory scale twin-screw extrusion. Physical properties are examined using differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), thermogravimetric analysis (TGA), tensile testing, impact testing, X-ray computed tomography (CT) scanning, and field emission scanning electron microscopy (FE-SEM). Molecular weight is determined using gel permeation chromatography (GPC). Miscibility of the blends is implied by the presence of a single glass transition temperature and homogeneous morphology. PLA/PMMA blends tend to show positive deviations from a simple linear mixing rule in their mechanical properties (e.g., tensile toughness, modulus, and stress at break). The addition of 40 wt % glass fiber to the system dramatically increases physical properties. Across all blend compositions, the tensile modulus increases from roughly 3 GPa to roughly 10 GPa. Estimated heat distortion temperatures (HDTs) are also greatly enhanced; the pure PLA sample HDT increases from 75 degrees C to 135 degrees C. Fiber filled polymer blends represent a sustainable class of earth abundant materials which should prove useful across a range of applications. (c) 2017 Wiley Periodicals, Inc.
机译:聚(丙交酯)(PLA)和聚(甲基丙烯酸甲酯)(PMMA)与使用实验室规模双螺杆挤出的切碎的玻璃纤维熔融配混。使用差分扫描量热法(DSC),动态机械热分析(DMTA),热重试验(TGA),拉伸试验,冲击试验,X射线计算机断层扫描(CT)扫描,以及场发射扫描电子显微镜(FE -SEM)。使用凝胶渗透色谱法(GPC)测定分子量。通过单一玻璃化转变温度和均匀形态存在暗示共混物的混溶性。 PLA / PMMA共混物倾向于显示在其机械性能(例如,抗拉韧性,模量和断裂中的抗拉韧性,模量和应力中的简单线性混合规则的正偏差。向系统中加入40wt%的玻璃纤维显着增加了物理性质。在所有混合组合物中,拉伸模量从大约3GPa增加到大约10GPa。估计的热畸变温度(HDT)也大大增强;纯PLA样品HDT从75摄氏度增加到135℃。纤维填充的聚合物共混物代表一种可持续类的地球丰富材料,其应该在一系列应用中证明有用。 (c)2017 Wiley期刊,Inc。

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