• 作者： 薛敬和
• 作者服務機構： 國立?華大學高分子研究所
• 中文摘要： 在本實?中我們嘗試用直接與間接陰離子聚合法來合成苯乙烯-環氧丙烷?團聯共聚合物，即新型熱可塑性橡膠。 經由實驗發現直接法不可行，因?此種陰離子聚合在接上一個環氧丙烷單體後引起鏈轉移而終止。間接法則得到良好的結果，理論上，間接陰離子聚合是一種基本耦合反應。活性末端接?NCO的聚苯乙烯和分子量約?五萬兩末端?OH的聚 環氧丙烷，由於NCO和OH的耦合反應而連結。所得的?團聯共聚合物用紅外線吸收光譜和GPC鑑定之。
• 英文摘要： Direct and indirect anionic polymerization were two methods used to synthesize styrene-propylene oxide triblock copolymers (ABA type thermoplastic elastomer). Through our experiments, it was found that the former method was unsuccessful. Due to the chain transfer reaction, the direct anionic polymerization was terminated after adding only few propylene oxide monomer units. However, the indirect anionic polymerization gave satisfying results. In principle, the indirect anionic polymerization method was essentially a coupling reaction. The polystyrene living ends were capped with isocynate groups and polypropylene oxide, with a molecular weight about 50,000, were synthesized with only two reactive hydroxyl end groups. Two capped polystyrene chains and the polypropylene oxide with two active end groups were then connected by a coupling reaction of OH and NCO. The product synthesized by this method was confirmed by IR spectra and gpc.
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