SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 32 ›› Issue (4): 446-453.

• Materials and Product Engineering •

### Synthesis and characterization of high strength polyimide/silicon nitride nanocomposites with enhanced thermal and hydrophobic properties

Tadele Daniel Mekuria1,2, Lei Wang1, Chunhong Zhang1, Ming Yang1, Qingtao Lv1, Diaa Eldin Fouad1

1. 1 Polymer Materials Research Center, Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;
2 Chemistry Department, College of Natural and Computational Sciences, Assosa University, Ethiopia
• Received:2020-01-17 Revised:2020-07-18 Online:2021-04-28 Published:2021-06-19
• Contact: Chunhong Zhang E-mail:zhangchunhong97@163.com
• Supported by:
The authors greatly appreciate the financial supports from the National Natural Science Foundation of China (51373044) and Natural Science Foundation of Heilongjiang Province of China (E2017018).

Abstract: Polyimide (PI) composite films were synthesized incorporating amino modified silicon nitride (Si3N4) nanoparticles into PI matrix via in situ polymerization technique. The mechanical and thermal performances as well as the hydrophobic properties of the as prepared composite films were investigated with respect to the dosage of the filler in the PI matrix. According to Thermogravimetric (TGA) analysis, meaningful improvements were achieved in T5 (5% weight loss temperature) and T10 (10% weight loss temperature) up to 54.1℃ and 52.4℃, respectively when amino functionalized nano-Si3N4 particles were introduced into the PI matrix. The differential scanning calorimetry (DSC) results revealed that the glass transition temperature (Tg) of the composites was considerably enhanced up to 49.7℃ when amino functionalized Si3N4 nanoparticles were incorporated in the PI matrix. Compared to the neat PI, the PI/Si3N4 nanocomposites exhibited very high improvement in the tensile strength as well as Young's modulus up to 105.4% and 138.3%, respectively. Compared to the neat PI, the composites demonstrated highly decreased water absorption behavior which showed about 68.1% enhancement as the content of the nanoparticles was increased to 10 wt%. The SEM (Scanning electron microscope) images confirmed that the enhanced thermal, mechanical and water proof properties are essentially attributed to the improved compatibility of the filler with the matrix and hence, enhanced distribution inside the matrix because of the amino groups on the surface of Si3N4 nanoparticles obtained from surface functionalization.