【摘要】 以异佛尔酮二异氰酸酯(IPDI)、聚酯二元醇、二羟甲基丙酸(DMPA)、三羟甲基丙(烷TMP)等为原料,合成了遇水膨胀型聚氨酯。用FTIR对该聚氨酯进行了结构表征,并对其遇水体积膨胀率和力学性能进行了研究。结果表明:NCO/OH摩尔比(异氰酸酯指数)为1.3～1.4时试样遇水体积膨胀率较高;随着DMPA用量的增加,试样的遇水体积膨胀率增大,拉伸强度保持率降低;加入TMP后,聚氨酯形成化学交联,拉伸强度保持率得到改善但,是试样的体积膨胀率随着TMP用量的增加而降低。更多还原

【Abstract】 Water swellable polyurethane was synthesized by isophorne diisocyanate(IPDI),polyester polyol,dimethylol propionic acid(DMPA),trimethylolpropane(TMP),and etc.The structure of polyurethane was characterized by FTIR.The water volume expansion rate and mechanical properties of polyurethane were also discussed.The results show that when the molar ratio of NCO/OH is 1.3~1.4,the water volume expansion rate of the sample is higher;with the increase of DMPA content,the water volume expansion rate of the sample increases,while the retention rate of tensile strength decreases;with the addition of TMP,the retention rate of tensile strength is improved because of chemical cross-linking,but the water volume expansion rate decreases with the increase of TMP content.更多还原