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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Chain Extender Structure on the Properties and Morphology of Polyurethanes Based on H_(12) MDI and Mixed Macrodiols (PDMS-PHMO)
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Effect of Chain Extender Structure on the Properties and Morphology of Polyurethanes Based on H_(12) MDI and Mixed Macrodiols (PDMS-PHMO)

机译：扩链剂结构对基于H_（12）MDI和混合大分子二醇（PDMS-PHMO）的聚氨酯的性能和形态的影响

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摘要

The effect of chain extender structure on properties and morphology of #alpha#,#omega#-bis(6-hydroxyethoxypropyl)polydimethylsiloxane (PDMS) and poly(hexamethylene oxide) (PHMO) mixed macrodiol-based aliphatic polyurethane elastomers was investi-gated using tensile testing,differential scanning calorimetry (DSC),and dynamic mechanical thermal analysis (DMTA).All polyurethanes were based on 50 wt % hard segment derived from 4,4'-methylenecyclohexyl diisocyanate (H_(12)MDI) and a chain extender mixture.1,4-Butanediol was the primary chain extender,while one of 1,3-bis(4-hydroxybutyl)tetramethyldisioxane (BHTD),1,3-bis(3-hydroxypropyl)tetrameth-yldisiloxane (BPTD),hydroquinonebis92-hydroxyethyl)ether (HQHE),1,3-bis(3-hy-droxypropyl)tetramethyldisilylethylene (HTDE),or 2,23,3,4,4-hexafluoro-1,5-pentanediol (HFPD) each was used as a secondary chain extender.Two series of polyurethanes containing 80 : 20 (Series A) and 60 :40 (Series B) molar ratios of primary and secondary chain extenders were prepared using one-step bulk polymerization.All polyurethanes were clear and transparent and had mumber-average molecular weights between 56,000 and 122,100.Incorporation of the secondary chain extender resulted in polyurethanes with low flexural modulus and high elongation.Good ultimate tensile strength was achieved in most cases.DSC and DMTA analyses showed that the incorporation of a secondary chain extender disrupted the hard segment order in all cases.The highest disruption was observed with HFPD,while the silicon-based chain extenders gave less disruption,particularly in Series A.Further,the silico chain extenders improved the compatibility of the PDMS soft segment phase with the hard segment,whereas with HFPD and HQHE,this was not observed.
机译：研究了扩链剂结构对#alpha＃，＃omega＃-双（6-羟基乙氧基丙基）聚二甲基硅氧烷（PDMS）和聚（六亚甲基氧化物）（PHMO）混合大分子二醇基脂肪族聚氨酯弹性体的性能和形态的影响拉伸试验，差示扫描量热法（DSC）和动态机械热分析（DMTA）。所有聚氨酯均基于源自4,4'-亚甲基环己基二异氰酸酯（H_（12）MDI）和扩链剂混合物的50 wt％硬链段.1,4-丁二醇是主扩链剂，而1,3-双（4-羟丁基）四甲基二碘烷（BHTD），1,3-双（3-羟丙基）四甲基-二硅氧烷（BPTD），氢醌双92-羟乙基中的一种）（HQHE），1,3-双（3-羟基丙基）四甲基二甲硅烷基乙烯（HTDE）或2,23,3,4,4-六氟-1,5-戊二醇（HFPD）分别用作第二级含有80:20（A系列）和60:40（B系列）摩尔比的一级和二级扩链剂的两个系列的聚氨酯采用一步本体聚合法制备，所有聚氨酯均为透明透明，平均分子量在56,000至122,100之间;二级扩链剂的引入导致聚氨酯的弯曲模量低，伸长率高，最终拉伸强度良好。 DSC和DMTA分析表明，在所有情况下，掺入二级扩链剂都会破坏硬链段的顺序.HFPD的破坏最大，而硅基扩链剂的破坏较少，特别是在A系列中。此外，硅链增长剂改善了PDMS软链段相与硬链段的相容性，而与HFPD和HQHE却没有观察到。

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