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標題: Preparation and Physical Properties of Poly(butylene terephthalate)/Silica Nanocomposites
作者: 陳金旗
Chen, Kinch
關鍵字: Poly(butylene terephthalate);聚對苯二甲酸丁酯;Silica;Nanocomposites;矽氧化物;奈米複合材料
出版社: 化學工程學系
The silica-master batch is introduced in proportion to the matrix of Poly(butylenes terephthalate) (PBT) by melt blending to prepare nanocomposites in this study. This master batch is prepared by the modified silica adsorbed with cationic surfactant in the water phase.
The XRD data demonstrated that the d-spacing of silica in nanocomposites is greater than 4.4 nm. Thermal Gravimetric Analysis gives an increases of 2.1℃ at 50 wt % loss temperature for silica reinforced PBT. Crystallization kinetics data at non-isothermal crystallization were carried out with t1/2 of PBT/silica nanocomposites decreased from 4.04 min to 0.82〜1.13 min at cooling rate of 5 ℃/min and the Avrami index of PBT/silica is between 3.3 and 4.03. Isothermal crystallization studies were also carried out with t1/2 of PBT/silica nanocomposites decreased from 1.2 min to 0.26〜0.33 min at crystallization temperature of 200 ℃. The Avrami index of PBT/silica nanocomposites is 2.58〜3.55 while that for PBT is 2.24. Polarized Optical Microscopy reveals that the addition of silica in PBT increases the density of nucleating site and decreases the size of crystallites grown in PBT matrix. Dynamic mechanical data shows the addition of silica enhances the storage moduli from 8.33×108 Pa to 9.11×108〜1.16×109 Pa measured at 30 ℃. The glass transition temperature increasing from 55.05 ℃ to 56.74〜58.95℃.

摘 要
經製備之聚對苯二甲酸丁酯/矽氧化物奈米複材,由TGA的結果發現添加矽氧化物於聚對苯二甲酸丁酯,50 %損失溫度由415.1 ℃上昇至417.2 ℃,上昇了2.1 ℃。XRD分析發現聚對苯二甲酸丁酯/矽氧化物,其層間大於4.4 nm。結晶動力學研究發現,在非等溫結晶方面,於降溫速率為5℃/min為例,聚對苯二甲酸丁酯/矽氧化物,其t1/2由4.04分鐘降至0.82〜1.13分鐘,降低了2.6〜3.9倍,n值在3.35〜4.03之間;在等溫結晶方面,於結晶溫度為200 ℃為例,添加矽氧化物於聚對苯二甲酸丁酯,其t1/2由1.2分鐘降至0.26〜0.33分鐘, 降低了1.7〜3.6倍,n值在2.58〜3.55之間。由POM分析發現添加矽氧化物於聚對苯二甲酸丁酯,在204 ℃等溫結晶下,其成核密度較純聚對苯二甲酸丁酯高,且球晶較細小,此為矽氧化物提供異質成核之證明。DMA分析發現,添加矽氧化物於聚對苯二甲酸丁酯之複材,於30 ℃下之儲存模數由8.33×108 Pa上昇至9.11×108〜1.16×109 Pa,提昇了9〜39 %,其玻璃轉移溫度由55.05 ℃上昇至56.74〜58.95℃,提昇了2〜4 ℃。
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