Anionic Synthesis and Dynamic Mechanical Poperties of Styrene/Isoprene Copolymers with Gradient Blocks

doi:10.11901/1005.3093.2019.289

Chinese Journal of Materials Research

2019, Vol. 33

Issue (11): 831-836 DOI: 10.11901/1005.3093.2019.289

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Anionic Synthesis and Dynamic Mechanical Poperties of Styrene/Isoprene Copolymers with Gradient Blocks

LIAO Mingyi(

),XU Xiaochuan

Department of Materials Science and Engineering, College of Transportation Engineering, Dalian Maritime University, Dalian 116026, China

Cite this article:

LIAO Mingyi,XU Xiaochuan. Anionic Synthesis and Dynamic Mechanical Poperties of Styrene/Isoprene Copolymers with Gradient Blocks. Chinese Journal of Materials Research, 2019, 33(11): 831-836.

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Abstract

The styrene (St)/isoprene (Ip) copolymers (S/I) with gradient blocks were synthesized by a one-step anionic polymerization technique with cyclohexane as solvent, n-butyl lithium (n-BuLi) as initiator and tetrahydrofuran (THF) as polar structure regulator. The microstructures and dynamic mechanical properties of synthesized S/I copolymers were characterized by ¹H-NMR and dynamic mechanic analysis (DMA), respectively. The effect of the time of THF addition and St content on the microstructure and the properties of S/I copolymers were investigated. The results show that the time of THF addition had a great effect on the microstructure, mechanical and dynamic properties of S/I copolymers, and the proper time of THF addition may be beneficial to modulate the copolymerization activity of St and Ip, and further modulate the microstructure and composition of the copolymers, therefore, S/I copolymers with gradient blocks could finally form, which possess broadened glass transition region and damping range. The evolution of structure and the properties of S/I copolymers were also analyzed theoretically.

Key words: organic polymer materials styrene/isoprene copolymers anionic polymerization synthesis gradient block structure dynamic mechanical properties

Received: 05 June 2019

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.289 OR https://www.cjmr.org/EN/Y2019/V33/I11/831

Fig.1 ¹H-NMR spectra of S/I copolymer

Table 1 Assignment of the peaks in the ¹H-NMR spectra of S/I copolymer

Table 2 Effect of the modifier addition time on the microstructure contents (mass fraction, %) of S/I copolymers

Table 3 Effect of the St content on the microstructure contents (mass fraction/%) of S/I copolymers

Table 4 Effect of the modifier addition time on the mechanical properties of S/I copolymers

Fig.2 Effect of the modifier addition times on dynamic mechanical properties of S/I copolymers

Fig.3 Effect of the modifier addition times on dynamic mechanical properties of S/I copolymers

Table 5 Effect of St content on the mechanical and dynamic properties of S/I copolymers

Fig.4 Effect of St content on dynamic mechanical properties of S/I copolymers (a) modifier addition time at 5 min; (b) modifier addition time at 10 min

Fig.5 Scheme of S/I chain structure

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