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首先利用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)对纳米SiO_2进行表面改性(SiO_2-MPS),再通过原位聚合法在SiO_2-MPS表面接枝聚甲基丙烯酸甲酯(PMMA)。采用熔融共混法将未改性和改性SiO_2与PMMA共混制成预分散母料,再分别与PMMA熔融共混制备纳米SiO_2/PMMA透明复合材料。用FTIR、TG和SEM对不同表面处理的纳米SiO_2和纳米SiO_2/PMMA复合材料的结构进行表征,并对其冲击强度、接触角和透光率进行表征。结果表明:SiO_2-MPS/PMMA复合材料中纳米SiO_2与MPS、MPS与PMMA间形成化学键,接枝率分别达到10.01%和22.95%,SiO_2-MPS-PMMA在PMMA中分散性最好,团聚现象明显减少,与纯PMMA相比,SiO_2/PMMA、SiO_2-MPS/PMMA和SiO_2-MPS-PMMA/PMMA复合材料的冲击强度、与水接触角均略有提升,透光率达到90%左右,最高可达94.2%。
Firstly, nano-SiO 2 was surface-modified with γ-methacryloxypropyltrimethoxysilane (MPS), and polymerized on the surface of SiO 2-MPS by in situ polymerization Ester (PMMA). The unmodified and modified SiO_2 and PMMA were blended to prepare the pre-dispersed masterbatch by melt blending, and then the blend was prepared by melt blending with PMMA respectively to prepare nano-SiO 2 / PMMA transparent composite. The structure of nano-SiO 2 and nano-SiO 2 / PMMA composites with different surface treatments were characterized by FTIR, TG and SEM, and their impact strength, contact angle and transmittance were characterized. The results show that the chemical bonds between SiO 2 -MPS / PMMA composites and MPS, MPS and PMMA are formed, the grafting rates are 10.01% and 22.95%, respectively. The dispersion of SiO 2 -MPS-PMMA is the best in PMMA and the agglomeration is obvious Compared with pure PMMA, the impact strength of SiO 2 / PMMA, SiO 2 -MPS / PMMA and SiO 2 -MPS-PMMA / PMMA composites increased slightly with the contact angle of water, the transmittance reached about 90%, the highest Up to 94.2%.