Young's Modulus Estimated from Orientation Distribution Functions of Crystal and Amorphous Phases for Simultaneous Biaxially Stretching Ultra-High Molecular Weight Polyethylene Films Prepared by Gelation/Crystallization from Solutions
| Autor: | Chunye Xu, Masaru Matsuo, Yuezhen Bin, Teruo Nakashima |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | International Journal of Polymeric Materials. 51:77-102 |
| ISSN: | 1563-535X 0091-4037 |
| Popis: | Young's modulus of simultaneous biaxially stretched films was much lower than that of uniaxial films with the same draw ratio. To address this problem, a theoretical approach was carried out by using a three-dimensional model. In this model system, the oriented crystalline layers are surrounded by an anisotropic amorphous phase and the strains of the two phases at the boundary are identical. Young's modulus was calculated by using the generalized orientation factors of crystallites and amorphous chain segments calculated from the orientation function of crystallites and that of amorphous chain segments. The orientation function of crystallites was determined from the orientation functions of the reciprocal lattice vectors of the crystal planes. The theoretical values of Young's modulus were calculated using the values of elastic compliance proposed by Zehnder. The values were in fairly good agreement with the experimental values of specimens with different draw ratios. Judging from the induced equations, the calculated results provided that the Young's modulus of simultaneous biaxially stretching film is attributed to the contribution from the compliance associated with shear modulus and consequently the Young's modulus automatically takes low values. |
| Databáze: | OpenAIRE |
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