Study on the volatilization behavior of monomer and oligomers in polyamide-6 melt by dynamic film–forming device
Author:
Zhu Xia1, Tao Linzhong1, Chen Liping1, Xiong Siwei1, Yang Feihua2, Jia Yingbin1ORCID, Wang Luoxin1, Wang Hua1
Affiliation:
1. College of Materials Science and Engineering, Hubei Key Laboratory for New Textile Materials and Applications , Wuhan Textile University , Wuhan , China 2. Beijing Building Materials Academy of Science Research, State Key Laboratory of Solid Waste Reuse for Building Materials , Beijing , China
Abstract
Abstract
In this study, a modified torque rheometer is used to investigate the volatilization behavior of monomer and oligomers in polyamide-6 (PA6) melt under dynamic film–forming conditions with negative pressure. The surface renewal model is employed to simulate the volatilization behavior. The effects of actual processing factors and simulation results on the volatilization behavior of monomer and oligomer are analyzed comparatively. It is found that the monomer and oligomers removal rate increase continuously with increasing temperature, residence time, and rotational speed. And, the cyclic dimer, which is extremely harmful to spinning, can be removed. It is found that the removal of monomer and oligomers continued to increase with increasing temperature, residence time, and spinning speed. Moreover, cyclic dimers, which are extremely harmful to spinning, are also removed. Additionally, it is discovered that the polycondensation reaction of PA6 results in an increase in the molecular weight and viscosity at lower temperatures (250 °C), while a higher temperature (270 °C) and shear rate (150 r/min) cause a reduction in viscosity and molecular weight.
Funder
Sichuan Province Key Research Projects State Key Laboratory of Solid Waste Reuse for Building Materials China National Textile and Apparel Council Application Fundamental Research Project
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Polymers and Plastics,General Chemical Engineering
Reference35 articles.
1. Žagar, E., Češarek, U., Drinčić, A., Sitar, S., Shlyapnikov, I. M., Pahovnik, D. Quantitative determination of PA6 and/or PA66 content in polyamide-containing wastes. ACS Sustainable Chem. Eng. 2020, 8, 11818–11826; https://doi.org/10.1021/acssuschemeng.0c04190. 2. Kumar, S. S., Kanagaraj, G. Effect of graphite and silicon carbide fillers on mechanical properties of PA6 polymer composites. J. Polym. Eng. 2017, 37, 547–557; https://doi.org/10.1515/polyeng-2015-0441. 3. Čolović, M., Vasiljević, J., Štirn, Ž., Korošin, N. Č., Šobak, M., Simončič, B., Demšar, A., Malucelli, G., Jerman, I. New sustainable flame retardant DOPO-NH-functionalized polyamide 6 and filament yarn. Chem. Eng. J. 2021, 426, 130760; https://doi.org/10.1016/j.cej.2021.130760. 4. Khun, N. W., Cheng, H. K. F., Li, L., Liu, E. Thermal, mechanical and tribological properties of polyamide 6 matrix composites containing different carbon nanofillers. J. Polym. Eng. 2015, 4, 367–376; https://doi.org/10.1515/polyeng-2013-0241. 5. He, W., Gao, J., Liao, S., Wang, X., Qin, S. A facile method to improve thermal stability and flame retardancy of polyamide 6. Compos. Commun. 2019, 13, 143–150; https://doi.org/10.1016/j.coco.2019.04.010.
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