中文摘要

本實驗將結晶性的對位聚苯乙烯(sPS)摻入不會結晶的亂排聚苯乙烯(aPS)。所使用的兩種aPS其重量平均分子量不同，[aPS(B)之Mw=1.1*105g/mol與aPS(S) Mw=1470g/mol ]，探討sPS分別摻入這兩種aPS後，其結晶行為與結晶形態之影響。

WAXD與FT-IR可判斷sPS晶型的轉變，將sPS/aPS(B)=90/10混摻物升溫量測晶型轉換，發現在150℃以下都為低結晶度、helical構形的g晶型；繼續升溫可轉化all trans構形之a晶型。

從DSC的結果顯示，sPS/aPS(B)之n值在2~3之間，sPS/aPS(S)之n值在2.3~4之間。sPS摻入aPS(S)，會使k值下降較明顯。sPS平衡熔點也會受aPS(S)的摻入而下降。

以POM可量測晶體成長速率並觀察結晶的形態。aPS(B)與aPS(S)摻入sPS皆會使晶體成長速率下降。在低結晶溫度下，晶體形態大都呈現球形；高結晶溫度下，晶體形態以軸晶居多。另外，摻入大小分子量aPS皆有sPS負型球晶的出現。

摻合樣品經醋酸戊酯蝕刻後，以掃描式電子顯微鏡（SEM）觀察aPS的分佈，摻入小分子aPS會造成較嚴重的微觀相分離。另外以SEM觀察正型、負型球晶的差異：正型球晶會形成散射狀或two eyes的形態；而負型球晶內之板晶束則以球晶中心，像玫瑰花瓣一層一層向外堆疊。

Abstract
Crystalline syndiotactic polystyrene(sPS) was blended with amorphous atactic polystyrene(aPS) in this research. After separation of the aPS, we got the aPS[aPS(B) of Mw=1.1*105g/mol and aPS(S) of Mw=1470g/mol]. I will discuss crystal behavior and morphology of sPS/aPS blends.
We can use wide angle x-ray diffraction(WAXD) and Fourier transform infrared spectrophotometers(FT-IR) to determine the crystalline form transition of sPS/aPS blends. I increase temperature to measure the crystalline form transition of sPS/aPS(B)=90/10 and discovery low crystallization degree and helical conformation of g form under 150℃；if I continue to raise temperature, I will get all trans conformation of a form over 150℃.
On the basis of the differential scanning calorimeter(DSC) results, n values for sPS/aPS(B) are 2~3 and n values for sPS/aPS(S) are 2.3~4. sPS was blended with aPS(S) causes k value to drop drastically. T was also decreased in the sPS/aPS(S) blends.
Polarized optical microscope(POM) has been used to study the effect of sPS/aPS blends on the crystal growth rate and the crystal morphology. Crystal growth rate may drop in sPS/aPS blends. At low crystallization temperature(Tc), crystal morphology appears spherulites for the most part；at high Tc, axialite was observed mostly in the crystal morphology. Besides, there exist both negative and positive spherulites in all sPS/aPS blends.
After using amyl acetate to etch blends, I observe aPS distribution by SEM. sPS was blended with aPS may cause it serious segregation. In addition, SEM observes negative and positive spherulites morphologies and there are so different：positive spherulite has radiate growth morphology and two eyes structure；lamellar stacks in negative spherulite are from the center of spherulite to outward that the heap of layers are like rose petals.

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