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首頁> 外文期刊>Chemical engineering journal >High performance polyurethane nanocomposite films prepared from a masterbatch of graphene oxide in polyether polyol
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High performance polyurethane nanocomposite films prepared from a masterbatch of graphene oxide in polyether polyol

機譯：由聚醚多元醇中氧化石墨烯的母料制備的高性能聚氨酯納米復合薄膜

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A masterbatch of graphene oxide (GO) in polyol was prepared and used for the preparation of polyurethane (PU)/GO nanocomposites by bulk in-situ polymerization. The prepared nanocomposites were characterized in terms of their thermal, mechanical, and morphological properties as a function of GO loading. Here, grafted PU chains on the surface of GO facilitated the beneficial stress transfer from the PU matrix to GO. This stress transfer occurs due to the reaction of the hydroxyl and carboxyl groups of GO with the isocyanate groups of 4,4'-methylene diphenyl diisocyanate (MDI) and the PU pre-polymer. The Young's modulus of the PU was improved by 280.5% through the incorporation of 3 wt% GO. Additionally, an improvement of 40.5% in the tensile strength and 19% in the elasticity was achieved at 1 wt% GO. Strain hardening of PU was improved with GO loadings up to 1 wt% due to the synergetic orientation of the soft segment and the PU-grafted GO in the strain direction. However, the large increase in cross-link density that occurred at 2 wt% GO prevented strain hardening, and the ultimate tensile strength decreased. The Halpin-Tsai model was used to predict the orientation of GO in PU nanocomposites. The randomly oriented 3D arrangement of GO in PU showed better agreement between the theoretically calculated and experimentally determined moduli compared to the 2D alignment. These results demonstrate that the preparation of PU nanocomposites using masterbatch dilution is an excellent method to attain well-dispersed GO. This technique can also be used to overcome the environmental problems associated with volatile organic compound (VOC) emission, as well as addressing some of the difficulties found in the plastics processing industry.
機譯：制備了多元醇中氧化石墨烯（GO）的母料，并將其用于通過本體原位聚合制備聚氨酯（PU）/ GO納米復合材料。制備的納米復合材料的熱，機械和形態學特性隨GO載荷的變化而變化。在此，GO表面上的接枝PU鏈促進了有利的應力從PU基質轉移到GO。由于GO的羥基和羧基與4,4'-亞甲基二苯基二異氰酸酯（MDI）和PU預聚物的異氰酸酯基反應而發生這種應力轉移。通過摻入3重量％的GO，PU的楊氏模量提高了280.5％。另外，在1重量％的GO下，抗拉強度提高了40.5％，彈性提高了19％。由于軟鏈段和PU接枝的GO在應變方向上的協同取向，當GO負載量高達1 wt％時，PU的應變硬化得到改善。但是，GO含量為2 wt％時，交聯密度的大幅增加阻止了應變硬化，并且極限拉伸強度降低。 Halpin-Tsai模型用于預測PU納米復合材料中GO的取向。與2D對齊方式相比，PU中GO的隨機定向3D排列在理論計算和實驗確定的模量之間顯示出更好的一致性。這些結果表明，使用母料稀釋法制備PU納米復合材料是獲得良好分散的GO的絕佳方法。此技術還可用于克服與揮發性有機化合物（VOC）排放相關的環境問題，并解決塑料加工行業中發現的一些困難。

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