嵌段式聚氨基甲酸酯(Segmented Polyurethane，SPU)是由軟質段與硬質段交替組成的嵌段式共聚物，軟質段造成了PU的柔軟性，而硬質段則因氫鍵鍵結提供了PU的剛性，所以軟硬質段材料的選用與比率的控制使得PU具有多樣的物理性質，應用性非常廣泛。
　　本實驗室過去為了瞭解離子基對水性PU(Waterborne Polyurethane)結構與物性的影響，所以在離子型水性PU有一系列的研究，並以穿透式電子顯微鏡分析微相結構，發現了水性PU三種模組，且此水性PU會產生特有的雙連續相網狀結構使材料具有高透光性、高剛性、高堅韌性、耐高溫且易於加工的特性。本研究將以此特色作為研究動機，採用Uniqema公司的近非極性防水性polyesters polyols(Priplast1838)作為軟質段，其特有的脂肪族結構會包圍酯基而具有抗水性，且其飽和長碳鏈的結構也會抗紫外線的裂解，接著以商業上比較大宗的二異氰酸鹽MDI (4,4-diphenylmethane diisocyanate)及鏈延長劑BD (1,4-butanediol)為硬質段，利用兩階段溶液聚合法，在聚合過程中分別導入自行合成的巨大基團 Bulky diol (N-(1,3-dihydroxy-2-methylpropan-2-yl)-2-propyl-pentanamide) 來進行硬質段的改質，合成出一系列不同硬質段含量與不同Bulky diol含量的嵌段式PU，並藉由FT-IR、TGA、DSC、DMA與拉力測試，探討PU在Bulky diol影響下造成的性質與結構變化。

　　Segmented polyurethane copolymers consist of soft and hard segments. Soft segments provide polyurethane soft property whereas hard segments offer the stiffness by hydrogen bondings. Therefore, material selection and ratio control of soft and hard segments could tailor make the many kinds of properties and applications of polyurethane copolymers.
　　In the past, our laboratory conducted a series of studies on waterborne polyurethane in understanding the effect of ionic group on the properties and structure. We observerd the micro phase morphology and found three waterborne polyurethane phase separated models. Its unique phase separated bicontinuous network structure provided waterborne polyurethane with properties such as transparency, stretchability, tenacity, thermostable and easy to process. This study follow the methods as my research motive, and segmented polyurethane based on priplast1838 (polyester polyols), 4,4-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BD) and N-(1,3-dihydroxy-2-methylpropan-2-yl)-2-propyl-pentanamide (bulky diol) are synthesized with two step solution polymerization. The characteristic of soft segments, saturated hydrocarbon, aliphatic alkane and highly branched, allow polyester polyols to have hydrolytic resistance, affinity for non-polar matrices, and the resistance to ultraviolet rays. The widely used hard segments, MDI and BD, are modified by self-synthesized bulky diol as substitutes for the ionic group of waterborne polyurethane in this study. The different of hard segment content and bulky diol content as variables are controlled in two step solution polymerization for a series of modified segmented polyurethane. All samples are analyzed by FT-IR, TGA, DSC, DMA and tensile testing. We discuss the results to realize the effect of bulky diol on the properties and structure for segmented polyurethane.

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