Studies and properties of styrene/butadiene/γ-(methacryloxypropyl) trimethoxy silane copolymer emulsion at room temperature

Abstract

The copolymer of styrene/butadiene/γ-(methacryloxypropyl) trimethoxy silane (random -Bd-St-MPS- copolymer) was synthesized by the semi-batch emulsion terpolymerization. The copolymer of random -Bd-St- and -Bd-St-MPS- copolymer were characterized by fourier transform infrared (FTIR) and proton nuclear magnetic resonance (¹H NMR) analysis, respectively. From FTIR and ¹H NMR, the random -Bd-St- and -Bd-St-MPS- copolymers were synthesized successfully. The effect of the St:Bd:MPS ratio on the solids content, particle size, fraction of gel, thermal properties, and mechanical properties were studied. The particle size distribution of emulsion was uniform. The thermal stability of the random -Bd-St-MPS- copolymer was better than that of -Bd-St-, and increased with the increasing of MPS feed content. When the mass of MPS was 2 phr, the tensile strength of silica reinforced -Bd-St-MPS- copolymer was 10.35 MPa.

Graphical Abstract

In general, the 100% modulus can be determined by the structure of copolymer. It shows that the 100% modulus increased with the increasing amount of MPS. It is due to the pre-crosslinking of the random -St-Bd-MPS copolymer caused by the hydrolysis and condensation of -Si(OCH₃) in the -St-Bd-MPS copolymer. Additionally, the tensile strength of silica reinforced copolymer vulcanizates tended to increase when MPS content was increased to 2 phr. It is due to the higher crosslink density in the -St-Bd-MPS copolymer than that of -St-Bd- copolymer.

Keywords:

• Styrene
• butadiene
• γ-(Methacryloxypropyl) trimethoxy silane
• copolymer
• mechanical properties

Disclosure statement

The authors declare that they have no conflict of interest.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China under Grant (No.51603168); Natural Science Foundation of Shaanxi Province under Grant (No. 2017JQ2011). The authors are grateful for support of the Lanzhou Chemical Research Center.