• 作者： 胡德
• 作者服務機構： 國立清華大學工業化學系
• 中文摘要： 以三種不同的聚合方法（整體、整體一懸浮，及懸浮）來合成耐衝擊性聚（苯乙烯／甲基丙烯酸甲酯）共聚合物。就其機械性質，透明性及一般性質來判斷，其中以整體聚合的較佳，代表性組成含甲基丙烯酸甲酯百分之七十，苯乙烯百分之二十五及聚丁二烯橡膠百分之五。如以 ASTM 方法來測定其各種物性是：張力強度6000psi；耐衝擊強度1.3 ft-1b/in；光透明性88%；軟化點 135 C；融態流動溫度185°C。相轉化點發生在固體含量達到百分之九或十時。由此可知，本實驗在改進ABS工程塑膠顏色方面的缺點，應屬成功，同時各種數據顯示，實驗室合成之MmBS塑膠各種性質和一般商業成品相若。
• 英文摘要： Rubber modified styrene/methyl methacylate polymers have been synthesized via threedifferent routes, i. e. bulk, bulk-suspension and suspension polymerization at 80-90°C. Whenthe overall (mainly mechanical and transparent) performance is concerned, the preferred onehas an initial composition of 70 wt% methyl methacrylate, 5 wt% polybutadiene rubber and 25wt% styrene via bulk polymerization at 90%C. Based on the ASTM method, its tensile strengthhas been determined as 6000 psi, impact strength of 1.3 ft-1b/in, the degree of light trans-mission of 88%, softening point of 135°C and flow beginning temperature of 185°C. Phaseinversion occurs at 9-10% of solid content. Thus, the tailor-made concept to modify ABS incolor deficiency has been accomplished. Furthermore these data indicate that the laboratory-made polymer is comparable with those made commercially.
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