Demonstrating the Effects of Processing on the Structure and Physical Properties of Plastic Using Disposable PETE Cups
Demonstrating the Effects of Processing on the Structure and Physical Properties of Plastic Using Disposable PETE Cups
复制标题
使用一次性 PETE 杯展示加工对塑料结构和物理性能的影响
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Sophie Ydstie
中科院分区：
文献类型：
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作者：
K. Erk;M. Rhein;M. Krafcik;Sophie Ydstie
介绍了一次性塑料杯的结构和物理性能与加工方法直接相关的教育活动。从聚（对苯二甲酸乙二醇酯）（PETE）杯，定向平行和垂直于热成型方向的壁切下的试样的力学性能，在张力下测量。平行样品表现出更大的弹性模量，屈服应力，主要是韧性变形行为相比，相对较弱，更脆的垂直样品。这种观察到的机械各向异性与杯内聚合物分子的加工诱导取向有关。该活动适合作为课堂演示、短期实验室任务或推广活动，有效地展示了聚合物加工、结构和性能之间的关系，而无需使用大型熔融加工设备。
An educational activity is described in which the structure and physical properties of disposable plastic cups were directly related to the method of processing. The mechanical properties of specimens cut from the walls of poly(ethylene terephthalate) (PETE) cups, oriented parallel and perpendicular to the thermoforming direction, were measured in tension. The parallel sample displayed greater elastic moduli, yield stress, and predominantly ductile deformation behavior compared to the relatively weaker and more brittle perpendicular sample. This observed mechanical anisotropy was related to the processing-induced orientation of polymer molecules within the cup. This activity, which is suitable as a classroom demonstration, short laboratory task, or an outreach activity, effectively demonstrates the relationship between polymer processing, structure, and properties without the use of large-scale melt processing equipment.