双组分偶氮聚合物胶体球制备及其光致形变行为研究

COLLOIDAL SPHERES COMPOSED OF TWO AZO POLYMERS AND THEIR PHOTOINDUCED DEFORMATION BEHAVIOR

研究了2种环氧树脂类含4-氨基-4′-硝基偶氮苯和4-氨基-4′-羧基偶氮苯生色团聚合物(BP-AZ-NT、BP-AZ-CA)双组分胶体球的制备和光致形变行为.通过在上述聚合物的四氢呋喃溶液中逐步加水诱导自组装的方法,得到了BP-AZ-CA/BP-AZ-NT双组分胶体球.在上述两种聚合物自组装形成胶体球过程中,较为疏水的BP-AZ-NT分子先发生聚集,而较亲水的BP-AZ-CA则在形成的胶体颗粒表面发生进一步聚集.在胶体球形成过程中,体系的临界水含量(CWC)主要由BP-AZ-NT发生聚集时的水含量决定,双组分胶体球的外层则含较多的BP-AZ-CA分子.比较单组分胶体球与双组分胶体球在线偏振Ar+激光(488nm,100mW/cm2)照射下的形变行为,进一步证实了通过上述方法可以制备BP-AZ-CA和BP-AZ-NT双组份的胶体球;胶体球形变时的初始拉伸速率由胶体球的外层聚合物分子的性质所决定。

Colloidal spheres composed of two amphiphilic azo polymers were fabricated and characterized.The colloidal spheres were prepared from BP-AZ-CA and BP-AZ-NT through gradual hydrophobic aggregation in THF-H2O solutions induced by increase in the water content.The relationship between the scattering light intensity and water content of the system was studied.The results show that during the aggregating progress,the more hydrophobic BP-AZ-NT tends to aggregate first,so the critical water content（CWC） of the system is determined by the more hydrophobic component.Because of the less hydrophobic molecules apt to aggregate later,so the outside layer of the colloidal spheres contains less hydrophobic BP-AZ-CA molecules.Upon irradiation of a linearly polarized Ar ＋ laser beam（488 nm,100 mW /cm2）,the hybrid colloidal spheres were elongated along the polarization of the laser beam.The results show that for the two-component colloidal spheres containing both BP-AZ-CA and BP-AZ-NT,the elongation rate of the colloidal spheres at first stage is similar to the colloidal spheres composed of BP-AZ-CA,but the final deformation degree is slightly smaller than that of BP-AZ-CA colloids.