Comparative examination of sensitizers in photografting on polymer films

Polymer Photochemistry Pub Date : 1986-01-01 DOI:10.1016/0144-2880(86)90005-9

Hitoshi Kubota, Kyoko Kobayashi, Yoshitaka Ogiwara

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引用次数: 14

Abstract

Photografting (λ > 300 nm) of methacrylic acid on low-density polyethylene film (thickness 30 μm) was carried out at 60°C for 60 min in water medium, and the activity of sensitizers towards the grafting was examined. Various sensitizers, involving hydrogen atom abstraction (aromatic ketones and quinones), radical generation, and energy transfer (aromatic hydrocarbons), were coated on the film sample beforehand. High percentages of grafting ( > 800%) were recorded for aromatic ketones (xanthone, thioxanthone and benzophenone), for quinones (2-chloroanthraquinone, 2-methylanthraquinone and 9,10-phenanthraquinone) and for radical generators (benzoin ethyl ether and phenyl disulfide). However, energy-transfer types (anthracene, phenanthrene and naphthalene) exhibited little effect on the grafting. Carbazoles, as well as the above sensitizers, were found to be considerably effective. Characteristics of each type of sensitizer are discussed in terms of the amount coated and the kinds of film (polypropylene and nylon 6) and monomer (acrylic acid and methyl methacrylate).

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高分子薄膜光接枝增敏剂的比较研究

光接枝(λ >在低密度聚乙烯薄膜(厚度30 μm)上进行了300 nm的甲基丙烯酸接枝反应，反应温度为60℃，反应时间为60 min，并考察了增敏剂对接枝反应的活性。各种增敏剂，包括氢原子提取(芳香酮和醌)、自由基生成和能量转移(芳香烃)，预先涂在薄膜样品上。嫁接率高(>芳香酮类(山酮、硫氧杂蒽酮和二苯甲酮)，醌类(2-氯蒽醌、2-甲基蒽醌和9,10-苯蒽醌)和自由基生成物(苯甲酸乙醚和苯基二硫化物)的含量均为800%。然而，能转移类型(蒽、菲和萘)对接枝反应的影响不大。咔唑，以及上述增敏剂，被发现相当有效。从涂敷量、薄膜种类(聚丙烯和尼龙6)和单体种类(丙烯酸和甲基丙烯酸甲酯)的角度讨论了每种类型敏化剂的特性。

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