聚氨酯/乙烯基酯树脂互穿聚合物网络合成动力学及相容性

POLYMERIZATION KINETICS AND COMPATIBILITY OF POLYURETHANE/VINYL ESTER RESIN INTERPENETRATING POLYMER NETWORKS

以丙烯酸乙酯为乙烯基酯树脂的共聚单体 ,利用“同步互穿”工艺室温固化制备了一系列聚氨酯 /乙烯基酯树脂互穿聚合物网络 (PU/VERIPN) .对IPN固化过程的动态跟踪及半定量考察的结果表明 :由于两网络不同的聚合机理及体系黏度的影响 ,PU网络先形成 ,网络形成得较完善 .采用示差扫描量热仪 (DSC)、原子力显微镜 (AFM )及透射电镜 (TEM)定性考察了IPN两网络间的相容性 ,结果表明 :形成的双相连续“同步互穿”体系的相畴尺寸在纳米级范围 ,当PU和VER的组成比为 80 /2 0和 70 /30时体系均出现一个玻璃化转变温度(Tg) ,较好地改善了PU与常规VER树脂的相容性 .进一步通过DSC实测和理论Tg 值的计算获得相容因子(θ) ,定量考察了两网络间的相容性 .

Polyurethane/vinyl ester resin interpenetrating polymer networks (PU/VER IPN) were synthesized at room temperature by polymerizing ethyl acrylate as VER's comonomer and simultaneous interpenetrating process. The curing process of the IPN was dynamically traced and semi-quantitatively analyzed by Fourier transform infrared spectroscopy (FT-IR). The result shows that the network of PU was formed firstly just because of different polymerization mechanism of the networks and the influence of viscosity. The results of the compatibility of the networks detected qualitatively by differential scanning calorimeter (DSC), atomic force microscopy (AFM) and transmission electron microscope (TEM) showed that the phase range of dual continuous simultaneous interpenetrating networks obtained were in nanometer scale. A single glass transition temperature (Tg), appeared for the IPNs with the component ratios of 80/20 and 70/30. The compatibility between polyurethane and general vinyl ester resin was improved. Compatibility factor (θ) was obtained through calculation of Tg detected by DSC and theoretical Tg. The compatibility of the networks was further detected quantitatively.