嵌段式聚氨基甲酸酯（Segment polyurethane , PU ） 由於具有複雜及龐大的結構及特殊的微相型態，因此反應出多變化的性質。對此，文獻上一直都沒有比較明確的結果，使得許多人無法詳細瞭解PU的真正性質。為了探討更詳細的PU性質，本實驗以傳統高分子量的cis-polybutadiene，經由臭氧化裂解（ozonolysis），氫化鋁鋰還原，製造出一系列不同分子量(Mn=700~3400)的聚醇(polyol)---cis-HTPB(Hydroxy terminated polybutadiene)，並以HTPB為軟質段(soft segment)的組成，MDI(4，4-diphenylmethane diisocyanate)及不同之鏈延長劑長度( -(CH2)n- n=2.3.4.5.6.10)，即EG、PrD、BD、PeD、HD、DD為硬質段(Hard segment)組成，在固定硬質段含量為50wt%下，聚合出一系列的線性嵌段式共聚合物，利用鑽石刀與超薄切片機來切數十奈米厚度的薄片，然後用染色劑OsO4來將軟硬質段做明顯對比變化，最後利用貴重儀器中心的穿透式電子顯微鏡（TEM）來觀察PU的分子結構，我們便可以利用分子的變化來探討高分子的物理性質。

Because segment polyurethane has large, complex construction and special microstructure, so it can react so much property. For this, literature did not have much clear result, make so much people can not know the real property of polyurethane. For to know the property of polyurethane, our laboratory use cis-polybutadiene, ozonolysis crack, uncross by lithium aluminum hydride, react a series different Mn= 700~3400 polyol ---- cis HTPB(Hydroxy terminated polyuretadiene), and use HTPB as soft segment, MDI(4,4-diphenylmethane diisocyanate) and different extender EG; PrD; BD; PeD; HD; DD as hard segment, under 50 wt% hard segment content, react a series linear segment copolymer, than use diamond knife and ultra-microtome to crave about 40 nm slice, than use OsO4 to imbue soft segment, finally use TEM to observe the structure of polyurethane, for this, we can know the physical property of polymer by the change of molecule.

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