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題 名 | 超高分子量與較低分子量聚丙烯混攙凝膠的結構與機械性質分析=Structure and Mechanical Properties of UHMWPP/LMWPP Blend Film by Gelation/Crystallization from Solution |
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作 者 | 蘇舜恭; 李麗玲; 吳進三; | 書刊名 | 高苑學報 |
卷 期 | 7:1 1998.02[民87.02] |
頁 次 | 頁337-359 |
分類號 | 467.4 |
關鍵詞 | 超高分子量的聚丙烯; 較低分子量的聚丙烯; 凝膠; 薄膜; 倒立滴落法; UHMWPP/LMWPP; Gelation; Film; Decalin; Up-side-down method; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究藉凝膠結晶方式,以十氫化�B(decalin, C�溟��)為溶劑在150℃等溫結 晶化的溫度下,製備超高分子量的聚丙烯(ultrahigh-molecular-weight polypropylene, UHMWPP)和不同的較低分子量的聚丙烯(low-molecular-weight polypropylene, LMWPP),依不同的重量組成比,所形成不同的凝膠混攙薄膜。藉偏光顯微鏡,廣 角X-ray繞射及電子顯微鏡,觀察凝膠薄膜結晶構造;以微差掃瞄卡計,測凝膠薄膜 的結晶度及熱性質分析;以萬能強力拉伸機,測凝膠抗張強度。在超高分子量聚丙 烯的含量及濃度增加時,薄膜熔點隨之增加,球晶也隨著增加。在較低分子量的聚 丙烯含量增加時,其結晶度與楊氏係數隨之下降,但其熔點幾乎無影響,但從逸散 因子tanδ中,可得到a及β的緩和運動(relaxations);隨著較低分子量的聚丙烯 含量之增加,a及β緩和溫度往低溫移動(shift)。 |
英文摘要 | By using the technique of gelation/crystallization, the blend films of ultrahigh-molecular-weight polypropylene (UHMWPP) and low-molecularweight (LMWPP) were prepared from diluted decalin solutions. The dried gel films were strentched in a hot oven at 150℃. The physical properties of the films were examined by D S. C., X-ray diffraction, tensile test, polarized optical microscopy, scanning electron microscopy, and dielectric analysis. Results show that both the melting point and the crystallinity of the film increase gradually with increasing polymer concentration and dielectric analysis. Results show that both the melting point and the crystallinity of the film increase gradually with increasing polymer concentration and molecular weight of UHMWPP in the blends. The crystallinity of the blends increases with both the polymer concentration and the UHMWPP content, and the structure of spherulites becomes more regular. While the temperature-dependent dielectric constant ε, increases, a and β relaxation peaks shift to lower temperatures with LMWPP content. |
本系統中英文摘要資訊取自各篇刊載內容。