以甲苯-2,4-二异氰酸酯(TDI)、聚碳酸酯二醇(PCDL)、二羟甲基丙酸(DMPA)和聚醚胺(ATA)为原料,采用A_2+B_3法合成了具有高度支化结构的水性聚氨酯(HBAPU)乳液.用红外光谱(TF-IR)对产物结构进行表征;用光子相关光谱(PCS)研究了乳液的稳定性能,NCO/OH=1.3,叫(DMPA)=6%时可以得到稳定的HBAPU乳液;采用旋转黏度计、差式扫描量热仪(DSC)、热失重分析仪(TG)、电子拉力机对产物的流变行为和各种性能进行了测试.结果表明,相对于线性水性聚氨酯(LAPU),HBAPU产物具有较低的黏度、良好的热稳定性、较高的T_g和拉伸强度.
Highly branched aqueous polyurethane (HBAPU) was synthesized via A_2 + B_3 approach using 2,4-toluylene diisocyanate(TDI), dimethylol propionic acid (DMPA), polycarbonatediol (PCDL) and poly(oxyalkylene) triamine (ATA) as materials. The structure of the products was characterized by. Fourier transform infrared spectroscopy (FT-IR). The stable ability of the HBAPU emulsions was investigated by photon correlation spectroscopy (PCS). A stable aqueous polyurethane dispersion was obtained when NCO/OH= 1.3 and the content of DMPA was 6.0%. The viscosity of the HBAPU was lower than that of linear aqueous polyurethane (LAPU). The thermal and mechanical properties of the products were measured by differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and tensile tests. The degradation temperature of the HBAPU was 100 ℃. The HBAPU showed higher T_g and tensile strength compared with LAPU. The T_g of the HBAPU was - 14.91 ℃, the tensile strength was 17.14 MPa and elongation was 359.1% at the break point.
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