Sandwich-structured nanocomposites have the potential to improve the mechanical and electrical properties of materials simultaneously. Nanofibrillated cellulose (NFC) modified paper sheet (denominated as N) and softwood paper sheet (denominated as P) are used to prepare insulating paper. Different kinds of insulating paper with the structures of PPP, NNN, NPN and PNP are prepared. Tensile strength, DC conductivity, dielectric response, space charge and breakdown strength are measured. The activation energies of prepared materials are calculated through DC conductivity at 30, 50, 70, and 90 °C. The mechanism for sandwich structure regulating the mechanical and breakdown properties of insulating paper is discussed. Oil impregnated N/P/N paper has a remarkable improvement on tensile strength, conductivity, and DC breakdown strength, which provides a promising scheme to obtain the insulating paper with outstanding tensile and breakdown strength.

中文翻译：

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纳米纤维素三明治结构绝缘纸的构建及其机电性能的增强


三明治结构纳米复合材料具有同时提高材料机械性能和电性能的潜力。纳米原纤化纤维素（NFC）改性纸（记为N）和软木纸（记为P）用于制备绝缘纸。制备了PPP、NNN、NPN、PNP结构的不同种类的绝缘纸。测量拉伸强度、直流电导率、介电响应、空间电荷和击穿强度。通过 30、50、70 和 90 °C 下的直流电导率计算所制备材料的活化能。讨论了夹层结构调节绝缘纸机械和击穿性能的机制。油浸N/P/N纸在拉伸强度、导电性和直流击穿强度方面都有显着的提高，这为获得具有优异拉伸和击穿强度的绝缘纸提供了一种有前途的方案。