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首页> 外文期刊>Journal of Applied Polymer Science >Block copolyesters of poly(pentamethylene 2,6-naphthalenedicarboxylate) and poly(tetramethylene adipate)
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Block copolyesters of poly(pentamethylene 2,6-naphthalenedicarboxylate) and poly(tetramethylene adipate)

机译：聚（五亚甲基2,6-萘二甲酸酯）和聚（己二酸四亚甲基酯）的嵌段共聚酯

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Hydroxy-terminated poly(pentamethylene 2,6-naphthalenedicarboxylate) oligomers were prepared by melt polycondensation of dimethyl 2,6-naphthalenedicarboxylate with excess 1,5-pentanediol followed by evacuating out some 1,5-pentanediol. The molecular weight of the poly(pentamethylene 2,6-naphthalenedicarboxylate) oligomers was controlled by the charge molar ratio of 1,5-pentanediol to dimethyl 2,6-naphthalenedicarboxylate and the amount of 1,5-pentanediol removed under vacuum. The H-1-NMR spectra of the poly(pentamethylene 2,6-naphthalenedicarboxylate) oligomers indicate that the transesterification between dimethyl 2,6-naphthalenedicarboxylate and 1,5-pentanediol was almost complete. Block copolyesters with hard segments of poly(pentamethylene 2,6-naphthalenedicarboxylate) and soft segments of poly(tetramethylene adipate) were prepared by coupling the poly(pentamethylene 2,6-naphthalenedicarboxylate) oligomer and a poly(tetramethylene adipate) glycol with methylene-4,4'-diphenylene diisocyanate in solution. The block copolyesters were characterized by IR, H-1-NMR, DSC, and X-ray diffraction. The hard segments in the block copolyesters display an amorphous state. However, the thermal transitions of soft segments in the block copolyesters are strongly dependent on the composition. When the content of the hard segments increases, the glass transition temperature of the soft segments increases. Thus, the amorphous parts of the soft segments would be partially miscible with the hard segments. When the content of the hard segments is very low, the soft segments of the block copolyesters exhibit high crystallinity. But, as the content of the hard segments is about 30 wt % or more, the soft segments of the block copolyesters become amorphous. This is described as the effect of the presence of the hard segments which are partially miscible with the soft segments. (C) 2002 Wiley Periodicals, Inc. [References: 29]
机译：通过使2，6-萘二甲酸二甲酯与过量的1，5-戊二醇熔融缩聚，然后抽出一些1，5-戊二醇，来制备羟基封​​端的聚（戊二甲基2，6-萘二甲酸戊二酯）低聚物。通过1，5-戊二醇与2，6-萘二甲酸二甲酯的进料摩尔比和在真空下除去的1，5-戊二醇的量控制聚（五亚甲基2，6-萘二羧酸二甲酯）低聚物的分子量。聚（五亚甲基2，6-萘二甲酸二甲酯）低聚物的1 H NMR谱表明2，6-萘二甲酸二甲酯和1，5-戊二醇之间的酯交换反应几乎完成。通过将聚（戊二甲基2,6-萘二甲酸二甲酯）低聚物与聚（己二酸四亚甲基酯）二醇和聚（己二酸四亚甲基己二酸酯）二醇低聚物和聚（己二酸四亚甲基己二酸酯）二醇偶联，制备具有硬链段的聚（戊二甲基2,6-萘二甲酸二甲酯）嵌段和软链段的嵌段共聚酯。溶液中的4,4'-联苯二异氰酸酯。通过IR，H-1-NMR，DSC和X射线衍射表征嵌段共聚酯。嵌段共聚酯中的硬链段显示出非晶态。但是，嵌段共聚酯中软链段的热转变强烈地取决于组成。当硬链段的含量增加时，软链段的玻璃化转变温度升高。因此，软段的无定形部分将与硬段部分混溶。当硬链段的含量非常低时，嵌段共聚酯的软链段显示出高结晶度。但是，当硬链段的含量为约30wt％或更高时，嵌段共聚酯的软链段变为无定形。这被描述为存在与软段部分混溶的硬段的影响。 （C）2002 Wiley Periodicals，Inc. [参考：29]

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