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Surface modification of glass beads with poly(acrylic acid)

机译：用聚丙烯酸对玻璃珠进行表面改性

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Non-porous P{sub}2 glass beads were etched with sodium hydroxide to increase the number of silanol groups that could be used to modify the surface. The etched glass beads were then functionalized with 3-aminopropyltriethoxysilane (APS) and/or glycidoxypropyltrimethoxysilane (GPS). The surface of the glass beads were further modified with poly(acrylic acid) (PAA) by reacting the carboxyl groups on PAA with the amino groups of the pregrafted APS. The chemical modifications were characterized by FT-IR spectroscopy, particle size analyzer and tensiometry for contact angle and porosity measurements. Five different molecular weight PAA polymers ranging from 2000 to 3,000,000 were grafted with less than expected increase of grafted PAA with molecular weight. The amount of APS and PAA on the surface was determined from thermogravimetric analysis and elemental analysis data. The surface properties of the surface modified glass beads were determined by measuring water and hexane penetration rate and contact angle. The surface morphology was examined by scanning electron microscopy.
机译：用氢氧化钠蚀刻无孔的P {sub} 2玻璃珠，以增加可用于修饰表面的硅烷醇基团的数量。然后将蚀刻的玻璃珠用3-氨丙基三乙氧基硅烷（APS）和/或环氧丙氧基丙基三甲氧基硅烷（GPS）功能化。通过使PAA上的羧基与预接枝的APS的氨基反应，用聚丙烯酸（PAA）进一步修饰玻璃珠的表面。化学修饰通过FT-IR光谱，粒度分析仪和用于接触角和孔隙率测量的张力测定法表征。接枝了5种分子量从2000到3,000,000的不同PAA聚合物，但接枝PAA的分子量增加幅度低于预期。根据热重分析和元素分析数据确定表面上的APS和PAA量。通过测量水和己烷的渗透速率和接触角来确定表面改性的玻璃珠的表面性质。通过扫描电子显微镜检查表面形态。

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