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Preparation and properties of wear-resistant and flame-retardant polyphenylsulfoneurea/monomer casting nylon copolymers |
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| Authors: | Feng Lang Ling Song Yi Lin Yilan You Duxin Li Qibin Jiang |
| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China Zhuzhou Times New Material Technology Co., Ltd., Zhuzhou, China;3. College of Materials and Chemical Engineering, Hunan City University, Yiyang, China;4. Zhuzhou Times New Material Technology Co., Ltd., Zhuzhou, China |
| Abstract: | A poly(phenylsulfone)-urea (PPSUU) macro-activator is synthesized by in situ anionic polymerization of 4,4′-diaminodiphenylsulfone and hexamethylene diisocyanate. The PPSUU segment is embedded into the nylon molecular chain through copolymerization to improve the wear resistance and flame retardancy of monomer cast nylon 6 (MC PA6) materials. The mechanical properties, thermal stability, friction and wear properties and combustion heat release rate of copolymers with different macro-activator contents are tested. Results indicate that a small amount of PPSUU can improve the wear resistance and impact properties of nylon materials. The wear loss of MC nylon is 54.8% less than pure MC nylon from 1.049 × 10−8 to 0.474 × 10−8 g/Nm with 6 wt% PPSUU. Moreover, better flame retardancy is verified. The peak of HRR reduced 36.8% from 654 to 413 kw/m2 with 4 wt% PPSUU, accompanied by advanced ignition time and flame extinction time, thus reducing the risk of fire. |
| Keywords: | copolymers friction polyamides wear and lubrication |