結晶性高分子的結晶特性及其所具有的結晶相，在過去的文獻當中有許多的討論，本文想要進一步探討對排聚苯乙烯的等溫結晶行為，並且經由示差掃瞄熱卡計(Differential Scanning Calorimeter, DSC)取得的實驗數據，再加上紅外光譜儀(FTIR)及X-ray繞射儀的分析結果，討論對排聚苯乙烯結晶相的變化。
本研究旨在討論在真空及空氣中照射不同劑量的加馬輻射(200kGy、400kGy、600kGy、800kGy)的非晶態對排聚苯乙烯，由高溫熔融態淬冷至不同的結晶溫度(Tc＝220℃、230℃、240℃、250℃、260℃)，持溫不同的時間後，對其等溫結晶行為有何影響。在相同的結晶溫度之下，隨著加馬輻射劑量的增加，對排聚苯乙烯的結晶度會越小，且達到飽和結晶度所需的時間就越久；而在相同加馬劑量照射之下，隨著等溫結晶溫度的提高，對排聚苯乙烯的結晶度也會越少，此外，對排聚苯乙烯在空氣中受加馬輻射照射所產生的結晶量，不管在哪一個結晶溫度下，都比在真空中受加馬輻射的對排聚苯乙烯來得大。再者，經由高斯函數和X-ray與FTIR的分析，可得知對排聚苯乙烯具有三種不同的晶相：α、β和β′相。由FTIR及X-ray的分析可知，在真空中受加馬輻射的對排聚苯乙烯，當等溫結晶溫度介於230℃∼250℃時，隨著持溫時間的增加，α所佔的比例會越來越多，β則是越來越少，會有α〞轉為β′的情形，而在空氣中照射加馬射線的對排聚苯乙烯結晶型態則與真空中的趨勢相反。

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