| Summary: | 碩士 === 南臺科技大學 === 化學工程與材枓工程系 === 105 === In this study, the silica nanoparticles were prepared by sol-gel method, and sul-fonated silica nanoparticles were prepared by sulfonation modification procedure. MAH-PP was used as a mixing device. And then the properties of the composite membrane were studied.
The results showed that the silica nanoparticles prepared by the nano-particles of silica by SEM, found that the uniform spherical silica nanoparticles, and with the polymerization time increases, the particles also will increase. (Si-O-Si) absorption peak at 766cm-1 and asymmetric stretching vibration of Si-O-Si (Si-O-Si) were measured by FT-IR. (C=C), the absorption peaks appear between 1000 and 1200 cm-1, and the carbon-carbon double bonds (C=C) of the vinyltrimethoxysilane are incorporated into the silica nanoparticles Peaks appear at 1410 cm-1 and 1602 cm-1. The sulfonated silica nanoparticles were detected by FT-IR. It was found that the absorption peak of benzene ring was 1129cm-1 due to the addition of sodium styrenesulfonate as the sulfonating agent to the silica nanoparticles. Benzene (S=O) absorption peak at 1040 cm-1 and asymmetric vibrational sulphonic acid (S=O) absorption peak at 1200 cm-1 and 100 cm-1, respectively. The absorption peak of the symmetric vibrating sulphonate (S=O) The hydroxyl (OH) absorption peak appears at about 3400 cm-1 because the sulfonate ion has the property of adsorbing water, which confirms the presence of sulfonate groups in the sulfonated silica nanoparticles. The sulfonation degree of the sulfonated silica nanoparticles was measured by the sulfonation degree. It was found that the sulfonation time of the polymerized silica nanoparticles increased with the sulfonation time, and the sulfonation degree also increased. MAH-PP MAH grafted by the determination that the addition of 4g MAH has the highest grafting rate, so choose to add 4g of MAH and different time polymerization of silica nanoparticles sulfonated at different times to do the sulfonated bis Silicon oxide nanoparticles mixed into a composite membrane.
MAH grafting rate of the composite membrane was determined that, in the acidic environment, the sulfonate itself may cause PP oxidation, leading to MAH more easily connected, so with the sulfonation time increases, MAH grafting rate increases. The smaller the corresponding frequency, the larger the agglomeration size of the composite membrane. Because ε "/ ε 'is large, the sulfonic acid group may be relatively sparse, and the interfacial polarization value of the composite film is relatively sparse. The larger the corresponding frequency, the smaller the agglomeration size of the composite membrane, because ε "/ ε 'is small, it is possible that the sulfonic acid group is more compact. The composite film can be obtained by puncture analysis, PP film itself, if not add other materials, then, PP surface pores will be relatively small, relatively high crystallinity, which leads to the highest puncture value, the highest tensile strength, MAH-PP lower crystallization , But increased the attraction between the MAH groups, resulting in decreased puncture value, sulfonated silica nanoparticles added MAH-PP internal significantly reduced crystallinity, but will attract each other due to polarity, the longer the time of sulfonation , The greater the relative attractiveness, so the puncture value will be higher and higher. It can be found that the number of hydrogen ions flowing in the MAH-PP itself can not be flowed by the MAH, so the number of hydrogen ions is relatively low, the current will be lower when the voltage is on, Sulfonation time is shorter, representing the sulfonation degree is relatively low, the number of flowable hydrogen ions is relatively small, in the pass on the voltage when the current is relatively low; sulfonation time is longer, on behalf of the sulfonation degree is relatively high, The number of hydrogen ions can flow more, in the pass on the voltage when the current is relatively high.
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