1-Acryloyl-4-acryloyloxy-2,2,6,6-tetramethylpiperidine (AATP) has been covalently attached to polypropylene under conditions of reactive processing to give substantial concentrations of essentially 100% grafted antioxidant (AATP-B). Solution of the concentrates showed that at high concentration of grafted antioxidant some homopolymerized AATP was present and the polymer undergoes transient cross-linking during processing. Concentrates of bound AATP (AATB-B) when used as conventional additives for polypropylene are very effective photoantioxidants due to conversion to the related polymer-bound nitroxyl radicals by photosensitized oxidation. A typical commercial hindered phenol, Irganox 1076, when used at low concentration in combination with -B also acts as a photosensitizer for nitroxyl formation. Unlike low molar mass-hindered piperidinoxyl, polymer-bound nitroxyls are effective thermal antioxidants that synergize very effectively with low concentrations of Irganox 1076.

中文翻译：

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抗氧化剂作用的机制：与聚合物结合的受阻胺的光抗氧化剂活性。二。双丙烯酸酯

1-丙烯酰基-4-丙烯酰氧基-2,2,6,6-四甲基哌啶（AATP）在反应过程的条件下共价连接到聚丙烯上，可得到实质上浓度为100％的接枝抗氧化剂（AATP-B）。浓缩液的溶液显示，在高浓度的接枝抗氧化剂下，存在一些均聚的AATP，并且聚合物在加工过程中发生瞬时交联。当用作聚丙烯的常规添加剂时，结合的AATP（AATB-B）的浓缩物是非常有效的光抗氧化剂，因为它通过光敏氧化转化为相关的聚合物结合的硝基氧基。当以低浓度与-B组合使用时，典型的市售受阻酚Irganox 1076也可作为光敏剂用于硝酰基的形成。与低摩尔质量阻碍哌啶子醇不同，