Synthesis and characterization of poly (3, 4-ethylenedioxythiophene) aqueous dispersions with low molecular weight poly (sodium styrene sulfonate) as template

doi:10.11949/j.issn.0438-1157.20171044

Abstract

Abstract:

Poly(sodium styrene sulfonate)s with low molecular weights were synthesized via reversible addition-fragmentation chain transfer polymerization(RAFT). Poly(3,4-ethylenedioxythiophene) aqueous dispersions were prepared with the low molecular weight PSS as the template. The structure and performance of PEDOT:PSS were investigated. The results from ¹H nuclear magnetic resonance(¹H NMR) showed that the PSS with molecular weight of 3900, 4900, 9600 and 18300 were successfully synthesized. Fluorescence spectrometry measurements showed that low molecular weight PSS prepared via RAFT can form micelles in water, and the critical micelle concentrations(cmc) were around 10^-6g·ml^-1. Four probe surface resistance tests showed that the conductivity of the PEDOT film were greatly improved when the low molecular weight poly (sodium styrene sulfonate) was used as the template, and the highest the conductivity of the PEDOT film was about 3 times of that of PEDOT film in which poly(sodium styrene sulfonate) produced via conventional free radical polymerization was used as the template. UV-vis spectra results illustrated that the transparency of PEDOT:PSS films decreased with the decrease of molecular weight of poly(sodium styrene sulfonate), and this is mainly due to the phase separation between the RAFT reagent segment and PEDOT:PSS. Thermal stability test showed that the low molecular weight PSS has no obvious effect on the thermal stability of PEDOT.

Key words: poly (3,4-ethylenedioxythiophene), poly (sodium styrene sulfonate), low molecular weight, conductivity, RAFT, polymers, synthesis, film

摘要：

通过RAFT聚合，制备了低分子量的聚乙烯基苯磺酸钠（PSS）；其次以低分子量的聚乙烯基苯磺酸钠为模板制备了聚3，4-二氧乙烯噻吩（PEDOT）：聚乙烯基苯磺酸钠（PSS）水分散体，研究了作为模板的聚乙烯基苯磺酸钠的不同分子量对PEDOT：PSS水分散体结构和性能的影响。结果显示：通过核磁氢谱（¹H NMR）表征，证明成功制备了分子量为3900，4900，9600和18300的聚乙烯基苯磺酸钠。用荧光探针法发现低分子量PSS在水中能形成胶束，临界胶束浓度在10^-6g·ml^-1左右。用四探针表面电阻测试发现，低分子量PSS为模板可明显提高PEDOT薄膜的导电性，最大提高了近3倍。用紫外可见分光光度计（UV）研究发现，以低分子量PSS为模板使PEDOT的透明性有一定的下降，这主要是由于RAFT试剂部分和PEDOT：PSS的相分离造成的。热稳定性的测试表明，低分子量PSS为模板对PEDOT的热稳定性没有明显的影响。

关键词: 聚3,4-二氧乙烯噻吩, 聚乙烯基苯磺酸钠, 低分子量, 导电性, RAFT, 聚合物, 合成, 膜

CLC Number:

O632.2⁺3

TANG Baokun, LI Jian, REN Qiang, WANG Chenyi. Synthesis and characterization of poly (3, 4-ethylenedioxythiophene) aqueous dispersions with low molecular weight poly (sodium styrene sulfonate) as template[J]. CIESC Journal, 2018, 69(5): 2309-2317.

唐宝坤, 李坚, 任强, 汪称意. 以低分子量聚乙烯基苯磺酸钠为模板的聚3,4-二氧乙烯噻吩水分散体的制备及性能[J]. 化工学报, 2018, 69(5): 2309-2317.

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