本研究將對排聚苯乙烯(sPS)/同排聚苯乙烯(iPS)混摻於熔融態以phase contrast OM觀察相分離隨時間變化，並將影像經FFT轉換，可計算出domain與domain的間距Λ，且隨時間變化可求得coarsening速率。並利用enthalpy relaxation以及SEM探討相溶性。sPS/iPS=50/50與sPS/iPS=30/70混摻於熔融態等溫不同時間後quench，在sub-Tg回火12小時，由DSC第一次升溫曲線可得一個recovery peak，但在150oC出現多個冷結晶峰，隨著於熔融態等溫時間增加，最後只剩下一個冷結晶峰。而由SEM影像，並沒有發現會相分離成兩層的情況。

利用SALS與POM量測sPS/iPS混摻冷結晶晶體成長速率，且觀察成長過程，發現於熔融態等溫不同時間後quench，冷結晶時iPS的晶體成長速率並不相同，且不同於sPS/aPS混摻，無法觀察到冷結晶時sPS的晶體成長。

Syndiotactic polystyrene / isotactic polystyrene blends were examined by phase contrast OM to study the changes of phase separation with time. The OM image, converted by FFT, helped to calculate the distance Λbetween domains and to determine the coarsening rate. Enthalpy relaxation and SEM were also used to explore the blend miscibility. Recovery peaks could be observed form the first DSC heating scan for the sPS/iPS=50/50 and sPS/iPS=30/70 blends, which were held at 300oC for various times, and quenched to room temperature, followed by sub-Tg annealing at 75oC for 12 hours. Multiple cold crystallization peaks appeared for short time residence of 300oC while only one cold crystallization peak was observed with the prolonged holding time at 300oC. Based on the SEM images, it was not found that phase separation was separated into two layers.

SALS and POM were used to observe the growth process to measure the growth rate of the iPS in the blends during cold crystallization at low temperatures. It was found, after quenching of the melting status (isotherm with different period), that the crystal growth rate of iPS in cold crystallization is different from sPS/aPS blends, and thus it is impossible to observe the crystal growth of sPS in the blend.

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