Kerr-Phillips Thomas, Damavandi Mona, Pilkington Lisa I, Whitehead Kathryn A, Travas-Sejdic Jadranka, Barker David
School of Chemical Sciences, University of Auckland, Private Bag, Auckland 92019, New Zealand.
The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6012, New Zealand.
Polymers (Basel). 2022 Jul 6;14(14):2767. doi: 10.3390/polym14142767.
The conformation of a fluorescent polymer, in the solid state or in solution, plays a critical role in the polymer's fluorescent properties. Thus, grafted side chains on a fluorescent polymer can directly influence its optical properties. In this study, the effect of grafted polymeric side chains on the photoluminescent properties of poly(para-phenylene vinylene) (PPV) and poly(para-phenylene ethynylene) (PPE) were investigated. Low- and high-molecular-weight grafts of neutral poly(n-butyl acrylate), cationic poly(trimethylaminoethyl methacrylate) and anionic poly(sulfopropyl acrylate) were grafted onto PPVs and PPEs, and the effect of the grafting on the graft copolymer's absorption and emission wavelengths, the fluorescence intensity and the quantum yield were studied. The results indicate that in the case of the ionic grafts, contrary to the expectations, the polymers have a reduced quantum yield. This contrasts with the copolymers with uncharged side chains (PBA), where a major increase in the quantum yield is seen for the self-quenching conjugated pristine polymers. These results reinforce that the molecular conformation of the polymer in a solid or solution plays a critical role in fluorescent polymers photoluminescent properties.
荧光聚合物在固态或溶液中的构象对其荧光性质起着关键作用。因此，荧光聚合物上接枝的侧链可直接影响其光学性质。在本研究中，研究了接枝的聚合物侧链对聚对苯撑乙烯（PPV）和聚对苯撑乙炔（PPE）光致发光性质的影响。将中性聚（丙烯酸正丁酯）、阳离子聚（甲基丙烯酸三甲基氨基乙酯）和阴离子聚（丙烯酸钠丙酯）的低分子量和高分子量接枝物接枝到PPV和PPE上，并研究了接枝对接枝共聚物的吸收和发射波长、荧光强度和量子产率的影响。结果表明，在离子接枝的情况下，与预期相反，聚合物的量子产率降低。这与带有不带电荷侧链（PBA）的共聚物形成对比，对于自猝灭共轭原始聚合物，其量子产率有显著提高。这些结果进一步证明，聚合物在固态或溶液中的分子构象对荧光聚合物的光致发光性质起着关键作用。
