A series of cationic water-borne polyurethane(CWPU) was synthesized from isophorone diisocyanate (IPDI), polyneopentanediol adipate (P756) and hydrophilic N-methyl dihydroxyethyl amine (N-MDEA) by using the one-step p...A series of cationic water-borne polyurethane(CWPU) was synthesized from isophorone diisocyanate (IPDI), polyneopentanediol adipate (P756) and hydrophilic N-methyl dihydroxyethyl amine (N-MDEA) by using the one-step process. Phase inversion of the cationic water-borne polyurethane was established by tracing the change of conductivity and speed of stirrer during the dispersion process.The conductivity of CWPU increased to a maximum, and then decreased to a stabe value.This result showed that the enrichment of partial anion and the gemination of ion occurred successively during the process of phase inversion.Conductivity kept stable after the Stern layer of the CWPU colloid particles were formed. The effects of dispersion temperature and the amount of N-MDEA on the particle size of CWPU were discussed. The particle size and polydispersity of CWPU were decreased with higher dispersion temperature and increasing amount of hydrophilic chain-extender. There existed optimal dispersion temperature and amount of chain-extender of the cationic polyurethane during the dispersion process. The DSC and DMA data of the cast film of CWPU showed that water could enter the partially disrupted ordered structure of the CWPU hard segment when phase inversion occurred at an appropriate temperature, and the stable, smaller particle size and polydisperse of the CWPU could be obtained.展开更多
以二羟甲基丙酸（DMPA）、A95氨基磺酸钠（固含量50%）为扩链剂,将羧基和磺酸基团同时引入到聚氨酯分子中,合成了一系列磺酸/羧酸型高固含量水性聚氨酯（ZW1~ZW4）,研究了磺酸基用量对水性聚氨酯性能的影响。利用傅里叶变换光谱仪、X射...以二羟甲基丙酸（DMPA）、A95氨基磺酸钠（固含量50%）为扩链剂,将羧基和磺酸基团同时引入到聚氨酯分子中,合成了一系列磺酸/羧酸型高固含量水性聚氨酯（ZW1~ZW4）,研究了磺酸基用量对水性聚氨酯性能的影响。利用傅里叶变换光谱仪、X射线衍射仪对合成的水性聚氨酯进行检测,结果表明反应按照预期路线进行。乳液性能测定结果表明,随着磺酸基用量的增加,乳液固含量增大,粒径减小且分布变宽,Zeta电位由-44.5 m V降低到-62.7 m V,但耐酸稳定性有所下降。胶膜性能测定结果表明,随着磺酸基的增加,胶膜的断裂伸长率由2 100%增加到2 800%,抗张强度从28 MPa下降到14 MPa,结晶度增大。此外,耐热性和耐水性都有所下降。展开更多
以二乙醇胺(DEA)和丁二酸酐为原料,甲醇为溶剂,合成一种新型羧酸型亲水单体N,N-二羟乙基-2-氨基丙酸(DMCA),优化得到DMCA的最佳条件为:冰水浴0℃,n(DEA)∶n(丁二酸酐)为1∶1.2,时间为80 min,甲醇用量为300 m L/mol(DEA),在最佳条件下DMC...以二乙醇胺(DEA)和丁二酸酐为原料,甲醇为溶剂,合成一种新型羧酸型亲水单体N,N-二羟乙基-2-氨基丙酸(DMCA),优化得到DMCA的最佳条件为:冰水浴0℃,n(DEA)∶n(丁二酸酐)为1∶1.2,时间为80 min,甲醇用量为300 m L/mol(DEA),在最佳条件下DMCA的转化率为86.18%。采用红外(FTIR)、核磁(1H NMR)、X射线衍射(XRD)、热重(TG)、元素分析等手段对DMCA进行结构和性能的表征。以DMCA作为亲水扩链剂制备超支化水性聚氨酯DMCA-HWPU,其性能检测结果表明,DMCA-HWPU为非结晶性体系,其乳液呈乳白色泛蓝光,无沉淀,乳液稳定性高,并且具有很好的热稳定性。展开更多
文摘A series of cationic water-borne polyurethane(CWPU) was synthesized from isophorone diisocyanate (IPDI), polyneopentanediol adipate (P756) and hydrophilic N-methyl dihydroxyethyl amine (N-MDEA) by using the one-step process. Phase inversion of the cationic water-borne polyurethane was established by tracing the change of conductivity and speed of stirrer during the dispersion process.The conductivity of CWPU increased to a maximum, and then decreased to a stabe value.This result showed that the enrichment of partial anion and the gemination of ion occurred successively during the process of phase inversion.Conductivity kept stable after the Stern layer of the CWPU colloid particles were formed. The effects of dispersion temperature and the amount of N-MDEA on the particle size of CWPU were discussed. The particle size and polydispersity of CWPU were decreased with higher dispersion temperature and increasing amount of hydrophilic chain-extender. There existed optimal dispersion temperature and amount of chain-extender of the cationic polyurethane during the dispersion process. The DSC and DMA data of the cast film of CWPU showed that water could enter the partially disrupted ordered structure of the CWPU hard segment when phase inversion occurred at an appropriate temperature, and the stable, smaller particle size and polydisperse of the CWPU could be obtained.
文摘以二羟甲基丙酸（DMPA）、A95氨基磺酸钠（固含量50%）为扩链剂,将羧基和磺酸基团同时引入到聚氨酯分子中,合成了一系列磺酸/羧酸型高固含量水性聚氨酯（ZW1~ZW4）,研究了磺酸基用量对水性聚氨酯性能的影响。利用傅里叶变换光谱仪、X射线衍射仪对合成的水性聚氨酯进行检测,结果表明反应按照预期路线进行。乳液性能测定结果表明,随着磺酸基用量的增加,乳液固含量增大,粒径减小且分布变宽,Zeta电位由-44.5 m V降低到-62.7 m V,但耐酸稳定性有所下降。胶膜性能测定结果表明,随着磺酸基的增加,胶膜的断裂伸长率由2 100%增加到2 800%,抗张强度从28 MPa下降到14 MPa,结晶度增大。此外,耐热性和耐水性都有所下降。
文摘以二乙醇胺(DEA)和丁二酸酐为原料,甲醇为溶剂,合成一种新型羧酸型亲水单体N,N-二羟乙基-2-氨基丙酸(DMCA),优化得到DMCA的最佳条件为:冰水浴0℃,n(DEA)∶n(丁二酸酐)为1∶1.2,时间为80 min,甲醇用量为300 m L/mol(DEA),在最佳条件下DMCA的转化率为86.18%。采用红外(FTIR)、核磁(1H NMR)、X射线衍射(XRD)、热重(TG)、元素分析等手段对DMCA进行结构和性能的表征。以DMCA作为亲水扩链剂制备超支化水性聚氨酯DMCA-HWPU,其性能检测结果表明,DMCA-HWPU为非结晶性体系,其乳液呈乳白色泛蓝光,无沉淀,乳液稳定性高,并且具有很好的热稳定性。
