In this work, synthetic talc was used as catalyst and filler aiming to obtain waterborne polyurethane (WPU) nanocomposites by in situ polymerization. Filler was used both in gel and in powder forms in order to compare its effects into the WPU matrix. The use of synthetic talc as filler is interesting due to the possibility of hydrogen bond formation between WPU chains/Si–O–Si and OH groups in synthetic talc edges promoting changes in physical, mechanical and thermal properties. Moreover, WPUs are environmentally friendly polymers replacing organic solvents by water as dispersion medium reducing pollutant emission in the atmosphere. Material structure analyzed by FTIR evidenced that it is possible to synthesize WPU using synthetic talc as catalyst and proved hydrogen bonding formation between synthetic talcs and WPU matrix. Synthetic talcs were well dispersed even with higher filler content, as supported by XRD, TEM, FESEM and AFM analyses. Thermal and mechanical performance was improved with synthetic talc fillers’ addition in order to obtain WPU nanocomposites. Also, T g of WPU nanocomposites was affected by fillers’ addition as presented by DSC corroborating synthetic talc good dispersion as evidenced by XRD and TEM analyses. Synthetic talcs used as catalyst/filler resulted in nanocomposites with superior thermal and mechanical properties being a new path to utilize synthetic talcs to obtain multifunctional materials.

中文翻译：

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合成滑石作为水性聚氨酯基纳米复合材料合成的催化剂和填料

在这项工作中，合成滑石粉被用作催化剂和填料，旨在通过原位聚合获得水性聚氨酯（WPU）纳米复合材料。填料以凝胶和粉末两种形式使用，以比较其对 WPU 基质的影响。由于 WPU 链/Si-O-Si 和合成滑石边缘中的 OH 基团之间可能形成氢键，从而促进物理、机械和热性能的变化，因此使用合成滑石作为填料很有趣。此外，WPUs 是一种环保聚合物，以水作为分散介质代替有机溶剂，减少了大气中的污染物排放。FTIR 分析的材料结构证明可以使用合成滑石作为催化剂合成 WPU，并证明合成滑石和 WPU 基质之间形成氢键。XRD、TEM、FESEM 和 AFM 分析表明，即使填料含量较高，合成滑石也能很好地分散。为了获得 WPU 纳米复合材料，通过添加合成滑石填料改善了热性能和机械性能。此外，WPU 纳米复合材料的 T g 受填料添加的影响，如 DSC 所示，XRD 和 TEM 分析证明合成滑石具有良好的分散性。合成滑石用作催化剂/填料产生具有优异热性能和机械性能的纳米复合材料，这是利用合成滑石获得多功能材料的新途径。WPU 纳米复合材料的 T g 受填料添加的影响，如 DSC 所示，XRD 和 TEM 分析证明合成滑石具有良好的分散性。合成滑石用作催化剂/填料产生具有优异热性能和机械性能的纳米复合材料，这是利用合成滑石获得多功能材料的新途径。WPU 纳米复合材料的 T g 受填料添加的影响，如 DSC 所示，XRD 和 TEM 分析证明合成滑石具有良好的分散性。合成滑石用作催化剂/填料产生具有优异热性能和机械性能的纳米复合材料，这是利用合成滑石获得多功能材料的新途径。