Abstract The synthesis of novel 1-(2-anthryl)-1-phenylethylene (APE) di-telechelic polyisobutylenes is described. Utilization of a difunctional cationic initiator and the in situ addition of the non-homopolymerizable APE lead to the formation of di-anthryl telechelic polyisobutylenes. Products were characterized by 1H NMR spectroscopy and Size Exclusion Chromatography. The polymers were UV irradiated at 365 and 254 nm and the reversible photocycloaddition of anthryl moieties was investigated. The chain extension of di-anthryl telechelic PIBs through photocoupling at 365 nm produced higher molecular weight products from low molecular weight precursors. The effect of precursor polymer concentration on the degree of chain extension was investigated, and intermolecular interactions leading to the formation of tetramers was observed. The photocoupled products were UV irradiated at 254 nm to induce the reversal of photocycloaddition of anthryl groups and to follow the consequent photoscission of polymers.

中文翻译：

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1-(2-蒽基)-1-苯基乙烯官能化聚异丁烯的紫外诱导可逆扩链

摘要 描述了新型 1-(2-蒽基)-1-苯基乙烯 (APE) 双遥爪聚异丁烯的合成。使用双官能阳离子引发剂和原位添加不可均聚的 APE 导致形成二蒽基遥爪聚异丁烯。通过1H NMR光谱和尺寸排阻色谱对产品进行表征。聚合物在 365 和 254 nm 下进行紫外线照射，并研究了蒽基部分的可逆光环加成。二蒽基遥爪 PIB 通过 365 nm 光耦合的扩链从低分子量前体产生了更高分子量的产物。研究了前体聚合物浓度对链扩展程度的影响，并观察到导致四聚体形成的分子间相互作用。