廖文彬2006-07-252018-06-282006-07-252018-06-282005http://ntur.lib.ntu.edu.tw//handle/246246/12489本報告將報導研究計劃「機械鬆弛定量分析模式建立：共聚合物組成」研究的成果。採用系統是以冰片烯(norbornene) 與乙烯為共單體的環烯烴共聚物(cyclic olefin copolymer)。隨著冰片烯(環狀結構)含量增加，共聚物的玻璃轉移溫度向高溫移動。使用DMA 量測頻率為1Hz 不同溫度下的機械鬆弛行為，顯示分子運動受到環狀結構的影響。進一步以Havriliak-Negami (HN)方程式分析機械鬆弛譜，可知冰片烯含量越高時，分子運動所需的活化能越高，熵值的變化也越大。由HN 方程式參數α及αβ的分析中可發現環狀結構明顯影響了局部、小規模分子鏈內(intra-chain)的運動，冰片烯含量較高的試片αβ值較低。α值則因為共聚物為非晶質結構因而已經非常接近1，較不易看出冰片烯含量對大規模分子鏈間(inter-chain)運動的影響。共聚合物由於另一種單體的加入造成了運動上的非均勻性inhomogeneous structure)，致使運動鬆弛譜變寬。本分析方法非常清楚的呈現了此結果。The effect of norbornene content on the isochronal mechanical relaxation spectra of cyclic olefin copolymers utilizing a dynamic mechanical analyzer (DMA) was studied in this work. As the amount of norbornene rings increased, the glass transition temperatures of the copolymers shifted to higher temperatures. From the result of DMA, it was clear the molecular motions were influenced by ring structures. Further analysis by Havriliak-Negami (HN) equation indicated that the higher the norbornene content, the larger the activation energy and the change of entropy of molecular motions. The analysis of parameters, and of HN equation showed copolymers with higher norbornene contents had lower values of That is, the intra-chain molecular motions were affected by the ring structures. The values of , however, were very close to unity due to the amorphous nature of the copolymers. Therefore, it was not easy to examine the effect of norbornene content on inter-chain motions.application/pdf299552 bytesapplication/pdfzh-TW國立臺灣大學材料科學與工程學系暨研究所環烯烴共聚合物機械鬆弛分析cyclic olefin copolymerdynamic mechanical analysisreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/12489/1/932216E002010.pdf