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| Research on Preparation and Properties of PPTA Fibrid |
| Received:September 05, 2023 Revised:September 21, 2023 |
| DOI：10.11981/j.issn.1000-6842.2024.04.146 |
| Key Words:PPTA;fibrid;nanostructure;property |
| Fund Project:上海市“科技创新行动计划”启明星培育扬帆专项（24YF2700600）；国家重点研发计划（2021YFB3700101）。 |
| Author Name | Affiliation | Postcode | | ZHAO Kairong | Sinochem High Performance Fiber Materials Co.， Ltd.， Yangzhou， Jiangsu Province， 211417 | 211417 | | LI Na* | Donghua University， Shanghai， 201620）
（E-mail： corresponding author:lina0607email@163.com | 201620 | | YU Junrong | Donghua University， Shanghai， 201620）
（E-mail： corresponding author:lina0607email@163.com | 201620 | | WANG Yan | Donghua University， Shanghai， 201620）
（E-mail： corresponding author:lina0607email@163.com | 201620 | | HU Zuming | Donghua University， Shanghai， 201620）
（E-mail： corresponding author:lina0607email@163.com | 201620 |
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| Abstract: |
| Para-aramid nano fibrid can be used as an ideal nano reinforcement material due to their unique morphology， structure， and mechanical properties. Based on the pre-synthetic solution of PPTA with low molecular weight， the relationship between PPTA polymer， solvent NMP and non-solvent （H2O and ethanol） in different titrant systems was explored， and PPTA nano fibrid was prepared by precipitation method. The results showed that compared with the H2O-NMP titrant system， the ethanol-NMP titrant system had higher titration accuracy for low molecular weight PPTA solution. The density of PPTA fibrid prepared by precipitation method was 1.41 g/cm3 using ethanol-NMP titrant system with ethanol mass fraction of 10%， with a maximum specific surface area of about 114.34 m2/g and a length-diameter ratio of 570. The PPTA fibrid had a clear amorphous structure with a crystallinity of 22.7%. Without glass transition or melting point， the PPTA fibrid exhibited significant thermal stability. |
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