中文摘要
本研究利用微分掃瞄熱卡計( DSC )、傅利葉紅外光譜儀( FTIR )，來探討純isotactic polystyrene(i-PS)系統及isotactic polystyrene/syndiotactic polystyrene ( i-PS/s-PS )之摻合系統高分子鏈結構型的轉變。在純i-PS與i-PS/s-PS摻合系統，在FTIR分析中發現隨著溫度的升高，不定型吸收峰強度逐漸減弱；結晶性吸收峰強度逐漸增強。由室溫緩慢升溫至200℃，不定型i-PS分子鏈結構型形成3/1( TG )3螺旋構型；不定型s-PS升溫到130℃附近轉變成α晶態，若持續升溫至180℃，再生成出β晶態。i-PS由於s-PS摻入的含量會影響到結晶i-PS分子鏈段形成速率之快慢。

Abstract
The conformational changes of pure isotactic polystyrene ( i-PS ) and isotactic polystyrene/syndiotactic polystyrene ( i-PS/s-PS ) blends were investigated by using differential scanning calorimeter ( DSC ) and fourier – transform infrared spectrometer ( FTIR ). Pure i-PS and i-PS/s-PS blends were analyzed by FTIR , intensity of amorphous bands gradual decrease with temperature increase , but crystal bands increase in intensity. From room temperature to 200℃ , amorphous i-PS chain became 3/1 helix conformation , amorphous s-PS became α – type crystal at 130℃, and β – type crystal appeared if at temperature higher than 180℃. The crystalline chains of i-PS growth rate decrease with increasing s-PS content in the blend.

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