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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >AQUEOUS DISPERSION OF POLYURETHANE ANIONOMER FROM ALIPHATIC DIISOCYANATES AND POLY(HEXAMETHYLENE CARBONATE) DIOL
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AQUEOUS DISPERSION OF POLYURETHANE ANIONOMER FROM ALIPHATIC DIISOCYANATES AND POLY(HEXAMETHYLENE CARBONATE) DIOL

机译：脂肪族双异氰酸酯和聚己二酸乙二醇酯在聚氨酯中的阴离子分散体

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摘要

Water dispersible polyurethanes (PUs) were prepared from poly-(hexamethylene carbonate) (PHC) diol, isophorone diisocyanates (IPDI), hexamethylene diisocyanate (HDI), and dimethylolpropionic acid (DMPA) as latent anionic sites. After neutralization of the carboxyl group from the DMPA unit with triethylamine (TEA), the PU anionomers were dispersed by adding water, following by crosslinking using triethylenetet-ramine (TETA). The particle size of the dispersion decreased with the content of DMPA and increased with HDI in the HDI-IPDI system, and it exhibited a minimum when the number-average molecular weight (M_n) of the prepolymer was 3000 and 4500, respectively. PUs with a higher content of hard segments from DMPA or TETA, or with a higher content of IPDI rather than HDI, had higher tensile moduli and storage moduli at room temperature. Ultimate tensile properties increased with an increase of the prepolymer molecular weight and the DMPA and HDI content.
机译：由聚（碳酸六亚甲基酯）（PHC）二醇，异佛尔酮二异氰酸酯（IPDI），六亚甲基二异氰酸酯（HDI）和二羟甲基丙酸（DMPA）作为潜在的阴离子位点制备水分散性聚氨酯（PU）。用三乙胺（TEA）中和来自DMPA单元的羧基后，通过加入水使PU阴离子聚合物分散，然后使用三亚乙基叔胺（TETA）进行交联。在HDI-IPDI系统中，分散体的粒径随DMPA含量的增加而减小，随HDI的增加而增大，当预聚物的数均分子量（M_n）分别为3000和4500时，其粒径最小。具有较高DMPA或TETA硬链段含量或IPDI而非HDI含量的PU在室温下具有较高的拉伸模量和储能模量。最终拉伸性能随预聚物分子量以及DMPA和HDI含量的增加而增加。

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