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Li SD, Chen J, Li LF, Wang ZF, Zhong JP, Yang L. VULCANIZATION CHARACTERISTICS OF NATURAL RUBBER COAGULATED BY MICROORGANISMS. RUBBER CHEMISTRY AND TECHNOLOGY 2018. [DOI: 10.5254/rct.82.83736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
ABSTRACT
The network variations of natural rubber (NR) during the vulcanization process were investigated by 1H chemical shift by liquid-state 1H nuclear magnetic resonance (NMR) spectroscopy. NR latex coagulated by microorganisms (NR-m) was contrasted with NR latex coagulated by acid (NR-a). The influences of the coagulation process on the structures, vulcanization characteristics, and mechanical properties of NR were analyzed. The results show that the cross-link density (XLD) and mass percentage of cross-link network (A(Mc)) can be increased with the increment of the vulcanization time; while the mass percentage of dangling free ends of the hydrocarbon and small molecules (A(T2)), the longitudinal relaxation time (T1), transverse relaxation time (T2), and molecular mass of inter–cross-link chains (Mc) decreased with the prolonging of vulcanization time both NR-m and NR-a. NR-m exhibits shorter scorch times (ts1, ts2) and optimum cure time (t90) and shows higher maximum torque (MH) and minimum torque (ML) than that of NR-a. It is obvious that the higher XLD and A(Mc) and lower A(T2), T1, T2, and Mc values of NR-m result in higher stress, tensile strength, and tear strength of NR compounds.
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Affiliation(s)
- Si-Dong Li
- College of Science, Guangdong Ocean University, Zhanjiang 524088, P.R. China
| | - Jing Chen
- Chemistry and Chemical Engineering School, Development Center for New Materials Engineering & Technology in Universities of Guangdong, Lingnan Normal University, Zhanjiang 524048, P.R. China
| | - Le-Fan Li
- College of Materials and Chemical Engineering, Hainan University, Haikou 570228, P.R. China
| | - Zhi-Fen Wang
- College of Materials and Chemical Engineering, Hainan University, Haikou 570228, P.R. China
| | - Jie-Ping Zhong
- College of Science, Guangdong Ocean University, Zhanjiang 524088, P.R. China
| | - Lei Yang
- College of Science, Guangdong Ocean University, Zhanjiang 524088, P.R. China
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Yu P, He H, Jiang C, Jia Y, Wang D, Yao X, Jia D, Luo Y. Enhanced oil resistance and mechanical properties of nitrile butadiene rubber/lignin composites modified by epoxy resin. J Appl Polym Sci 2015. [DOI: 10.1002/app.42922] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Peng Yu
- School of Materials Science and Engineering, South China University of Technology; Guangzhou 510641 People's Republic of China
| | - Hui He
- School of Materials Science and Engineering, South China University of Technology; Guangzhou 510641 People's Republic of China
| | - Can Jiang
- School of Materials Science and Engineering, South China University of Technology; Guangzhou 510641 People's Republic of China
| | - Yunchao Jia
- School of Materials Science and Engineering, South China University of Technology; Guangzhou 510641 People's Republic of China
| | - Dongqing Wang
- School of Materials Science and Engineering, South China University of Technology; Guangzhou 510641 People's Republic of China
| | - Xiaojie Yao
- School of Materials Science and Engineering, South China University of Technology; Guangzhou 510641 People's Republic of China
| | - Demin Jia
- School of Materials Science and Engineering, South China University of Technology; Guangzhou 510641 People's Republic of China
| | - Yuanfang Luo
- School of Materials Science and Engineering, South China University of Technology; Guangzhou 510641 People's Republic of China
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