Studies of non-isothermal crystallization and melting of ultra high molecular weight polyethylene |
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Authors: | Yan Zhu Linkai Chang Shouzhi Yu |
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Institution: | (1) Institute of Chemistry, Henan Academy of Sciences, 450003 Zhengzhou, Henan, P. R. China |
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Abstract: | The non-isothermal crystallization and melting of ultra high molecular weight polyethylene (UHMWPE) were observed by means of differential scanning calorimetry and compared with those of ordinary high-density polyethylene (HDPE). The crystallization temperature (T c ) and melting point (T m ) of UHMWPE were found to be higher thanT c andT m of HDPE, and the latent heat of crystallization (δH c ) and fusion (δH m ) of UHMWPE are smaller thanδH c andδH m of HDPE. The results were explained in terms of the theory of polymer crystallization and the structure characteristics of UHMWPE. The relationships between the parameters (T c ,T T ,δH c andδH m ) and the molecular weight (M) of UHMWPE are discussed. Processing of the experimental data led to the establishment of four expressions describing the above relationships. |
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Keywords: | crystallization DSC melting ultra high molecular weight polyethylene |
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