Construction of ion bonds in gel-free polydiene-based ionomers without compromising molecular weight

et al. 2023

Self Cite

With the increasing demand for high-performance damping rubber material in various fields, improving the damping performance of existing nonpolar rubber has garnered tremendous scientific and industrial interest. However, it remains a long-standing challenge to improve the damping properties of nonpolar rubber materials due to their low intrinsic glass transition temperature (T g ) and incompatible surface energy with high-damping polar polymers or fillers. To solve this conundrum, ultra-low gel multifunctional carboxyfunctional high vinyl polybutadiene HVBR (HVBR/COOH-x%) was prepared by grafting 3-mercaptopropionic acid (3PMA) onto HVBR via thiolÀene photo-Àclick. The effects of reaction parameters including molecular weight, 1,2-vinyl content, photoinitiators, reaction time, thiol and photoinitiator dosage on gel content and carboxyl grafting ratio were investigated. The HVBR/COOH-x% demonstrate a controllable grafting ratio range from 2% to 73%. Furthermore, the increased T g and intermolecular force resulted in excellent performance, including high-glass transition temperature of 26.3 C, tensile strength of 15.52 MPa, and elongation at break of 396.16%. Particularly with a wide range of effective damping temperatures above 46.6 C. Meanwhile, COOH endowed the HVBR with better self-viscosity, but also equipped it with stronger mutual viscosity. Therefore, this experiment proposes a feasible path to high damping and high adhesion in nonpolar rubber materials.

Section: Resultsmentioning

confidence: 83%

Section: Damping and Surface Propertiesmentioning

confidence: 99%

High‐damping ultralow−gel nonpolar elastomeric polymer through thiol−ene photo−click chemistry reaction

Zhang

Gao

et al. 2023

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“…Figure 6d,e shows that E and E h increase with the increase of prestrain, and E and E h of silica/SBR/TESPT and silica/SBR‐g‐HEA are higher than that of silica/SBR composites. The “coupling bridge” between rubber molecular chain and filler can be built by SBR‐g‐HEA and TESPT 41 . Therefore, the force between rubber filler networks increases, and the force between filler‐filler networks decreases, resulting in an increase in E and E h .…”

Section: Resultsmentioning

confidence: 99%

“…The "coupling bridge" between rubber molecular chain and filler can be built by SBR-g-HEA and TESPT. 41 Therefore, the force between rubber filler networks increases, and the force between filler-filler networks decreases, resulting in an increase in E and E h . Figure 6f shows that the E h /E of silica/SBR-g-HEA and silica/SBR/TESPT force between filler-filler.…”

Section: Interfacial Interaction Of Silica/sbr Compositesmentioning

confidence: 99%

A novel strategy to functionalize styrene butadiene rubber toward enhanced interfacial interaction with silica

Qin

et al. 2023

Incorporation of nanofillers (such as silica) into elastomer matrix is the most common strategy to prepare high‐performance rubber products. However, the poor dispersion of nanofillers in non‐affinity rubber materials and the weak interfacial interaction significantly limit the processing and mechanical properties. To reduce the polarity difference and enhance the interfacial interaction between silica and styrene butadiene rubber (SBR), we prepared a hydroxyethyl acrylate‐grafted SBR (SBR‐g‐HEA) through the redox initiator system, and subsequently fabricated SBR‐g‐HEA/silica nanocomposites by simple mechanical blending. The effects of reaction conditions on the grafting rate were studied in detail. ATR‐FTIR and 1H‐NMR collectively confirmed the successful grafting of HEA groups on SBR molecular chains, and the grafting fraction could be regulated from 0% to 2.5%. Scanning electron microscope (SEM) and rubber processing analyzer (RPA) showed that the incorporation of HEA could significantly improve the dispersion of silica nanoparticles in SBR matrix. Notably, the resulting SBR‐g‐HEA exhibited significantly enhanced attributes when compared to their unmodified counterparts, including superior mechanical properties, improved wear resistance, and reduced heat generation. The strategy proposed here provided insights toward the fabrication of non‐affinity rubber/filler nanocomposites for high‐performance rubber products and green tire.

“…[5][6][7] EPDM has excellent aging resistance (ozone resistance, heat resistance and weather resistance) and good compatibility with PP, 8,9 but also has poor adhesion and a relatively high price. 10,11 High vinyl polybutadiene rubber (HVPB) has good thermo-oxidative aging resistance, good damping performance at room temperature 12,13 as well as good compatibility with PP. Therefore, a TPV composed of HVPB and PP may be promising.…”

Section: Introductionmentioning

confidence: 99%

High vinyl polybutadiene rubber/polypropylene thermoplastic elastomer blends: Optimization of internal mixing process parameters and screening of processing methods

Yue

Geng

et al. 2023

Self Cite

Thermoplastic vulcanizates (TPV) composed of high vinyl polybutadiene rubber (HVPB) and polypropylene (PP) have good thermal stability and damping properties. This work aims to apply a design of experiments (Taguchi L9 orthogonal array) to optimize the mixing parameters (rotor speed, temperature, and time) for the HVPB/PP TPV. The effects of these mixing parameters on its physical and mechanical properties of HVPB/PP TPV follow the order: rotor speed > temperature and time. In the case of the master batch process, the optimum mixing parameters are 60 rpm, 180°C and 8 min. Subsequently, four processes (master batch, static vulcanization, rubber‐plastic premixing, and two‐step processing) are compared using the same optimum mixing parameters. The master batch process turns out to be the best in terms of physical and mechanical properties.