【作者】 刘一志；

【导师】 孙毅；

【作者基本信息】 哈尔滨工业大学 ， 固体力学， 2009， 硕士

【摘要】 倍半硅氧烷(POSS)作为一种特殊的有机-无机杂化材料,在近几年的研究中备受人们关注。聚偏二氟乙烯(PVDF)是目前实际应用中压电性能最好的含氟塑料。利用两种材料的各自特点,通过改变POSS的有机-无机官能团能将POSS与PVDF结合成复合材料。本文对PVDF材料及POSS/PVDF材料的熔融共混制备方法进行了详细的研究,并表征了材料的力学性能,详细研究了合成条件(温度、转速、时间)对材料力学性能的影响,获得了最佳的实验工艺。熔融共混法加工过程中的混合温度、转速、时间对材料的成型和性质有着显著的影响,为得到最好的实验工艺。应用正交实验设计法设计出九组科学的实验工艺条件,并按上诉工艺将PVDF材料、质量比为5%和10%的POSS/PVDF材料制成α晶型膜材料,对三种不同配比九组不同工艺制备的薄膜进行力学性能测试。实验结果表明,少量的POSS单体杂化到PVDF材料中,能使材料的拉伸强度有显著的提高。且当混合温度为180°C、转速为140rpw和混合时间为5min时,材料的力学性能最好。利用低温过拉伸的方法,对三组材料进行了从α晶型到β晶型的转变,通过进行力学实验,对三种不同配比九组不同工艺制备的薄膜进行力学性能测试。结果表明低温过拉伸后的材料呈明显的脆性断裂特征,得出了最佳实验工艺并对多组材料进行了力学上的分析和对比。更多还原

【Abstract】 Polyhedral oligomeric silsesquioxane (POSS) as a special family of organic-inorganic hybrid material has attracted considerable interest in the last few years. Poly(vinylidene fluoride)(PVDF) is the fluoro-plastics which has the best properties of piezoelectric material in practical applications. These nanoparticles can be tailored to maximize the interactions in prominent merits of them between the POSS compounds and the PVDF polymer by the modification of the organic groups surrounding the inorganic cage. The paper studied the synthesis of methods of melt blending of PVDF and POSS/PVDF particularly. The mechanical properties of materials were characterized and Effect of different synthesis conditions to mechanical property such as temperature, rotation and time were investigated in detail. The optimizations were obtained.There is significant effect on preparation and mechanical properties of method of melt blending conditions including temperature, rotation and time .Nine kinds of scientific conditions of methods were designed by orthogonal experiment method ,αphase of PVDF and the addition of five and ten weight percent of POSS were prepared . The mechanical properties of films of 9 different technologies of 3 different proportions were investigated.the result show that a small quantity of POSS can increase the modulus of hybrid materials observably.when the condition that the temperture was 180°C,the rotation speed was 140rpw and time was 5min was applied , the hybrid material had the best mechanical property.The crystal form the hybrid materials had changed fromαtoβphase by using cryopanel tensile method, The mechanical properties of films of 9 different technologies of 3 different proportions were investigated.the result show the samples undergo a typical polymeric brittle fracture feature and the optimize experimental process was obtained. Mechanical of meterials had been analysed and constasted.更多还原