衝撃式粉砕による粒子の微細化と物性変化におよぼす添加物の影響 (第3報)

ポリプロピレン微粉体表面のその場改質

抄録

The variation in particle size, specific surface area, S_p, and dispersibility in a polar liquid were measured by the continuous grinding of polypropylene (PP) with a non-ionic surfactant (NP7.5) or a titanate coupling agent (KR9S). With an amount of additive of 1mmol per kg PP, S_p increased by 20-30%, and the energy efficiency of comminution increased by a factor of three to four. The surface of PP beeame hydrophilic by adding 60mmol NP 7.5 per kg PP during the comminution, as revealed from the comparison of apparent partice size in water, ethanol and cyclohexane. Although the crystallographical degradation was enhanced by the additives, no change in the molecular weight distribution was observed even after intensive grinding with additives. Tribochemical sorption on the surface of PP was, therefore, not detected.