Biaxial Stretching of Ultra-High Strength Polyolefin Gel Films

超高强度聚烯烃凝胶薄膜的双向拉伸

• 批准号: 8713531
• 负责人: Thein Kyu
• 金额: $ 12.73万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-08-01 至 1991-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8713531&HistoricalAwards=false
• 关键词: Biaxial; Stretching; Ultra; Strength; Polyolefin

The project deals with the study of biaxial stretching of ultra- high molecular weight polyolefin gel films, especially UHMWPE and UHMWPP. Uniaxially drawn UHMWPE gels have shown ultra-high strength comparable to its counterparts such as steel or KevlarR fibers. However, such uniaxially driven fibers are inherently weak in transverse direction due to fibrillation. The lateral strength may be significantly improved by introducing biaxial orientation in the gels. The PI will perform cross-rolling of UHMWPE gels prior to biaxial stretching to limit significant reduction of sample thickness during biaxial stretching. Another area that will be addressed is to study the mechanisms of gel drawing by probing labelled molecules. A third area that will be addressed is a study of melting and crystallization behavior of UHMWPE gels and the deformation mechanisms of gel spherulites by conventional time-resolved light scattering, SAXS, WAXD and optical microscopy.

该项目介绍了超高分子量聚芬凝胶薄膜的双轴拉伸的研究，尤其是UHMWPE和UHMWPP。 单透透吸uhmwpe凝胶显示出与钢或凯夫拉尔纤维等对应物相当的超高强度。 但是，由于纤颤，这种单轴驱动的纤维在横向方向上固有地弱。 通过在凝胶中引入双轴方向，可以显着提高侧向强度。 PI将在双轴拉伸之前对UHMWPE凝胶进行交叉卷，以限制双轴拉伸过程中样品厚度的显着降低。 将要解决的另一个领域是通过探测标记的分子来研究凝胶图的机理。 将解决的第三个区域是对UHMWPE凝胶的熔融和结晶行为的研究以及通过常规时间分辨的光散射，SAXS，WAXD和光学显微镜的凝胶球体的变形机制。