In the present work ZnO nano particles have been synthesized and stabilized by polyvinyl alcohol, PVA, under in situ and ex situ condition and focused on the effect of reaction conditions on the stabilization and dispersion of ZnO nano particles in PVA. From particle size analysis it is evident that, the rate of agglomeration is slower for ex situ synthesis method. It was also observed that the peak has shifted towards lower diameter value of the nano particles. The synthesis of ZnO nano particle has further been established with UV–VIS peak at around 350 nm and morphology study by FESEM study. EDAX spectra exhibited that weight percent of ZnO NP formed is around 2.5%. Dynamic mechanical study and thermal study was also made with the samples. It has been observed that mechanical property under dynamic condition is better with ex situ samples and storage modulus is 1.7 times higher than the in situ sample. Thermal property of PVA has been improved with composite formation as the percent char has been increased in case of composites.

中文翻译：

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ZnO纳米粒子在PVA基质中的稳定和分散

在本工作中，已经在原位和异位条件下用聚乙烯醇PVA合成并稳定了ZnO纳米颗粒，并着眼于反应条件对ZnO纳米颗粒在PVA中稳定和分散的影响。从粒度分析可以明显看出，非原位合成法的团聚速度较慢。还观察到峰已经向纳米颗粒的较低直径值偏移。进一步建立了ZnO纳米粒子的合成方法，在350nm左右具有UV-VIS峰，并通过FESEM研究了形貌。EDAX光谱显示形成的ZnO NP的重量百分比约为2.5％。样品也进行了动态力学研究和热学研究。已经观察到，在动态条件下，非原位样品的机械性能更好，并且储能模量比原位样品高1.7倍。随着复合材料的形成，PVA的热性能随着复合材料的形成而得到改善，因为炭含量增加了。