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首页> 美国卫生研究院文献>Polymers >Minimizing the Strong Screening Effect of Polyhedral Oligomeric Silsesquioxane Nanoparticles in Hydrogen-Bonded Random Copolymers
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Minimizing the Strong Screening Effect of Polyhedral Oligomeric Silsesquioxane Nanoparticles in Hydrogen-Bonded Random Copolymers

机译：最小化氢键无规共聚物中多面体低聚倍半硅氧烷纳米粒子的强筛选作用

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摘要

A series of poly(vinylphenol-co-methacryisobutyl polyhedral oligomeric silsesquioxane) (PVPh-co-PMAPOSS) random copolymers have been synthesized through free radical copolymerizations of acetoxystyrene with methacryisobutyl POSS monomer and subsequent hydrazine monohydrate-mediated hydrolysis of the acetoxyl units. These random copolymers were characterized using nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), and differential scanning calorimetry (DSC), which revealed that the POSS content in the random copolymers could be varied by changing the POSS monomer feed ratio by 1H NMR analyses. This molecular design approach allowed us to investigate the thermal properties and hydrogen bonding interactions of these PVPh-co-PMAPOSS random copolymers in comparison with those of PVPh/PMAPOSS blend systems. Hydrogen bonding interactions were absent in the PVPh/PMAPOSS blend system, because of a strong screening effect; in contrast, the PVPh-co-PMAPOSS random copolymers experienced enhanced intramolecular hydrogen bonding that minimized the strong screening effect of the POSS nanoparticles.
机译：通过乙酰氧基苯乙烯与甲基丙烯酸异丁基POSS单体的自由基共聚反应，以及随后的肼一水合物介导的乙氧基单元水解，已经合成了一系列的聚（乙烯基苯酚-甲基丙烯酸异丁基多面体低聚倍半硅氧烷）（PVPh-co-PMAPOSS）无规共聚物。使用核磁共振波谱（NMR），傅里叶变换红外光谱（FTIR），凝胶渗透色谱（GPC）和差示扫描量热法（DSC）对这些无规共聚物进行了表征，结果表明无规共聚物中的POSS含量可以变化通过 1 1 H NMR分析改变POSS单体进料比。与PVPh / PMAPOSS共混体系相比，这种分子设计方法使我们能够研究这些PVPh-co-PMAPOSS无规共聚物的热学性质和氢键相互作用。由于强烈的屏蔽作用，PVPh / PMAPOSS共混体系中不存在氢键相互作用。相反，PVPh-co-PMAPOSS无规共聚物的分子内氢键增强，这使POSS纳米颗粒的强屏蔽作用最小化。

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