Latex co‐coagulation approach to fabrication of polyurethane/graphene nanocomposites with improved electrical conductivity, thermal conductivity, and barrier property
Latex co‐coagulation approach to fabrication of polyurethane/graphene nanocomposites with improved electrical conductivity, thermal conductivity, and barrier property
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DOI：
10.1002/app.43117
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发表时间：
2016-03
影响因子：
3
通讯作者：
Shengli Wu;Tie-jun Shi;Liyuan Zhang
中科院分区：
文献类型：
--
作者：
Shengli Wu;Tie-jun Shi;Liyuan Zhang
本研究描述了一种简单有效的合成聚氨酯/石墨烯纳米复合材料的方法。阳离子水性聚氨酯（CWPU）被用作聚合物基体，和氧化石墨烯（GO）作为起始纳米填料。通过首先将CWPU乳液与GO胶体分散体混合来制备CWPU/GO纳米复合材料。带正电荷的CWPU乳胶粒子通过静电相互作用组装在带负电荷的GO纳米片表面。然后，通过在DMF中用水合肼处理CWPU/GO得到CWPU/化学还原GO（RGO）。X射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）和拉曼光谱分析结果表明，RGO纳米片在CWPU基体中分散良好，且呈剥离状。CWPU/RGO纳米复合材料的电导率可达0.28 S m-1，热导率高达1.71 W m-1 K-1。CWPU/RGO涂覆的PET膜的氧气透过率（OTR）显著降低至0.6cm 3 m-2 day-1，表明高氧气阻隔性。CWPU/RGO纳米复合材料的导电性、导热性和阻隔性的显著改善归因于静电相互作用和RGO纳米片在CWPU基体中的分子水平分散。© 2015 Wiley Periodicals，Inc. J.应用聚合物Sci. 2016，133，43117。
This study describes a simple and effective method of synthesis of a polyurethane/graphene nanocomposite. Cationic waterborne polyurethane (CWPU) was used as the polymer matrix, and graphene oxide (GO) as a starting nanofiller. The CWPU/GO nanocomposite was prepared by first mixing a CWPU emulsion with a GO colloidal dispersion. The positively charged CWPU latex particles were assembled on the surfaces of the negatively charged GO nanoplatelets through electrostatic interactions. Then, the CWPU/chemically reduced GO (RGO) was obtained by treating the CWPU/GO with hydrazine hydrate in DMF. The results of X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Raman analysis showed that the RGO nanoplatelets were well dispersed and exfoliated in the CWPU matrix. The electrical conductivity of the CWPU/RGO nanocomposite could reach 0.28 S m−1, and the thermal conductivity was as high as 1.71 W m−1 K−1. The oxygen transmission rate (OTR) of the CWPU/RGO-coated PET film was significantly decreased to 0.6 cm3 m−2 day−1, indicating a high oxygen barrier property. This remarkable improvement in the electrical and thermal conductivity and barrier property of the CWPU/RGO nanocomposite is attributed to the electrostatic interactions and the molecular-level dispersion of RGO nanoplatelets in the CWPU matrix. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43117.