State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, PR China.
J Phys Chem B. 2013 Jul 25;117(29):8880-6. doi: 10.1021/jp401261u. Epub 2013 Jul 15.
Different crystalline forms are obtained by simply manipulating the good/poor solvent ratio in mixed solvents of toluene/ethanol. Depending on different solvent ratios, poly(9,9-dioctylfluorene)s (PFOs) can generate a large palette of morphologies including lenticular crystals, fibrous crystals and rod-like crystals. In the crystallization process, polymer chains experience different kinetic pathways, yielding lenticular crystals in the toluene solution, rod-like crystals at a low toluene/ethanol ratio (1:1), and fibrous crystals at a high toluene/ethanol ratio (3:1). A combination of atomic force microscopy (AFM) and transmission electron microscopy (TEM) provides an opportunity to elucidate the distinctive molecular arrangements in these different crystals. Moreover, the influence of molecular weights on the crystallization of polymers has also been investigated in different crystals.
通过简单地控制甲苯/乙醇混合溶剂中的良/不良溶剂比，可以得到不同的晶体形态。根据不同的溶剂比，聚（9,9-二辛基芴）（PFO）可以生成包括透镜状晶体、纤维状晶体和棒状晶体在内的大量形态。在结晶过程中，聚合物链经历不同的动力学途径，在甲苯溶液中生成透镜状晶体，在低甲苯/乙醇比（1:1）下生成棒状晶体，在高甲苯/乙醇比（3:1）下生成纤维状晶体。原子力显微镜（AFM）和透射电子显微镜（TEM）的组合为阐明这些不同晶体中独特的分子排列提供了机会。此外，还研究了分子量对不同晶体中聚合物结晶的影响。
