Mechanical behavior and molecular orientation of polycarbonate plates prepared by press‐induced deformation,Journal of Applied Polymer Science

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Mechanical behavior and molecular orientation of polycarbonate plates prepared by press‐induced deformation
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-11-18 , DOI: 10.1002/app.50125
Bolun Wang _{1,

2} , Tao Wang _{1,

2} , Yong Ge _{1,

2} , Jianlin Lang _{1,

2} , Qiwei Sun _{1,

2} , Yuhong Chen _{1,

2} , Yue Yan _{1,

2}

Affiliation

Through a uniaxial hot compression method, polycarbonate (PC) plates were self‐reinforced effectively by press‐induced deformation. Relationships between macroscopic mechanical properties including tensile, impact as well as viscoelastic properties, and microscopic status such as morphologies and orientation were obtained in deformed PC plates. Results showed that PC plates which were compressed at appropriate temperatures (20°C–120 °C) obtained simultaneous enhancements in tensile strength (28%), elastic modulus (38%) and impact strength (700%), compared with the original plate. The impact fracture morphologies of deformed PC plates revealed evident ductile breakage. Wide‐angle X‐ray diffraction investigations were conducted to attribute mechanical behavior to molecular segment orientation, which was more sensitive to temperature. Self‐reinforced mechanism was proposed to analyze the high correlation between various orientations of molecular segments and corresponding mechanical performance, explained by storage and loss moduli in dynamic mechanical analysis as supplemental verification. Press‐induced deformation was proved to be a potentially effective method for the self‐reinforcement treatment for PC transparent products.

中文翻译：

压制变形制备的聚碳酸酯板的力学行为和分子取向

通过单轴热压缩方法，聚碳酸酯（PC）板通过压制变形有效地自我增强。在变形的PC板中获得了包括拉伸，冲击以及粘弹性等宏观机械性能与微观状态（如形态和取向）之间的关系。结果表明，与原始板相比，在适当温度（20°C–120°C）下压缩的PC板同时具有拉伸强度（28％），弹性模量（38％）和冲击强度（700％）的增强。。变形的PC板的冲击断裂形态显示出明显的韧性断裂。进行了广角X射线衍射研究，以将机械行为归因于对温度更敏感的分子链段取向。提出了一种自增强机制来分析分子链段的各个方向与相应的机械性能之间的高度相关性，并通过动态力学分析中的存储模量和损耗模量作为补充验证加以解释。事实证明，压制变形是PC透明产品自增强处理的潜在有效方法。

更新日期：2020-12-23

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