Study on damping properties of HVBR/EVM blends prepared by in situ polymerization

Li, Kai; Lv, Qingqing; Hua, Jing

doi:10.1016/j.polymertesting.2017.02.026

Cited by 56 publications

(46 citation statements)

References 11 publications

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“…In general, because of the lower C─H bond dissociation energy of the allyl group compared to that of the tertiary carbon, the I 1 radical was more easily formed than the I 2 radical. However, when the blends contained minute levels of HVBR, the number of I 2 radicals was much higher than that of I 1 radicals, and because of the barrier effect of FEPM (FEPM–HVBR exhibited a similar sea‐island structure; that is, FEPM was the sea phase, and HVBR was the island phase), the I 1 radicals tended to couple with I 2 radicals to produce crosslinks. However, as the HVBR content was increased, the island phase of HVBR also increased; this increased the probability of reaction A.…”

Section: Resultsmentioning

confidence: 99%

Curing of a tetrafluoroethylene–propylene elastomer with high‐vinyl polybutadiene rubber and peroxide

Cong

Liu

Wei

et al. 2019

J of Applied Polymer Sci

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A cocuring agent is necessary for tetrafluoroethylene–propylene elastomer (FEPM), which cannot be cured by peroxide alone. We observed that high‐vinyl polybutadiene rubber (HVBR) could be used as a cocuring agent for FEPM. The structure and properties of FEPM–HVBR blend vulcanizates were investigated by 13C‐NMR, differential scanning calorimetry, swelling tests, tensile tests, dynamic mechanical analysis, and thermogravimetric analysis. This research showed that HVBR significantly improved FEPM by conferring a high crosslink degree to the FEPM–HVBR blends. When the HVBR concentration was 25% without any filler reinforcement, the tensile strength of the FEPM–HVBR blend vulcanizate reached 11.6 MPa, and the crosslinking density reached 171 μmol/cm3. In addition, HVBR improved the thermal stability of FEPM and changed the glass‐transition temperature (T g) of the blend; as the HVBR content increased, the T g of the blend also increased. 13C‐NMR analysis confirmed that crosslinks existed between the HVBR and FEPM macromolecules. When the blends contained trace amounts of HVBR, free‐radical reaction was more preferred between FEPM and HVBR, whereas when HVBR was 15% or more, crosslinking between HVBR was predominant. These findings expand the choices for the curing of FEPM. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47836.

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Section: Resultsmentioning

confidence: 99%

Curing of a tetrafluoroethylene–propylene elastomer with high‐vinyl polybutadiene rubber and peroxide

Cong

Liu

Wei

et al. 2019

J of Applied Polymer Sci

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“…Polymer‐based damping materials, with significant contributions toward suppressing vibration and noise, therefore have received extensive attentions . For traditional polymer‐based damping materials, such as blending, copolymerization, and interpenetrating networks materials, external energy dissipated through the internal friction of polymer chains is the major damping mechanism for the improvement of damping properties . However, because of the limit of internal friction, the limited improvement may find it hard to satisfy the increasing requirement today .…”

Section: Introductionmentioning

confidence: 99%

Molecular Insights Into Chain Length Effects of Hindered Phenol on the Molecular Interactions and Damping Properties of Polymer‐Based Hybrid Materials

Zhou

et al. 2019

Polymer Engineering & Sci

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For hindered phenol (HP)/polymer‐based hybrid damping materials, the unclear relationship between the structure of HP and the damping properties limits the application of such promising materials. Herein, three kinds of HPs with different chain lengths were synthesized to explore the mechanism. The structures of the HPs were confirmed by nuclear magnetic resonance spectrum, the Fourier Transform Infrared Spectroscopy (FT‐IR), and X‐ray Diffraction (XRD). For further prepared HP/polyurethane hybrids, FT‐IR and XRD were adopted to confirm the hydrogen bonding interactions and micromorphologies. Moreover, molecular dynamics simulation was used to characterize the effects of chain length variation on the inter‐ and intramolecular hydrogen bonds (HBs) and the chain packing of the hybrids in a quantitative manner. Subsequently, combined with the dynamic mechanical analysis, the relationship between the chain length variation and the damping properties was established. The results showed that with the increasing of chain length, the intramolecular HBs between HPs can be prevented, and the loose HP chain within tight polymer matrix can be achieved, which results in a maximum increase of loss factor. While the homogeneity of the chain packing increases with the chain length increasing, which results in a decrease of the temperature range of loss factor ≥ 0.3. POLYM. ENG. SCI., 60:446–454, 2020. © 2019 Society of Plastics Engineers

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“…[17][18][19][20] Moreover, the microstructure of rubber chain is the determining factor for the mechanical properties. Atactic 1,2-polybutadiene (1,2-PB) rubber with dense vinyl groups and few double bonds on backbone exhibiting excellent wet-skid resistance, low rolling resistance, low heat build-up, and good aging resistance [21][22][23][24][25] can meet the requirements of high-performance green tire. A molybdenum (Mo)-based catalyst system can provide higher activity for coordinate polymerization of 1,2-PB compared with other catalyst systems such as titanium and chromium-based catalyst system.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of 1,2‐polybutadiene grafting with poly(1,3‐butadiene)‐block‐(dimethylsiloxane)

Liu

et al. 2019

Polymers for Advanced Techs

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The development of silica‐filling elastomers with high mechanical performance and good processability is still a great challenge. In this study, we fabricated siloxane‐grafted atactic 1,2‐polybutadiene (1,2‐PB) rubber through grafting poly(1,3‐butadiene)‐block‐(dimethylsiloxane) (PB‐b‐PDMS) onto 1,2‐PB molecular chains by coordination polymerization using a molybdenum (Mo)‐based catalyst system. The PB‐b‐PDMS with active double bonds was synthesized by anionic polymerization. Fourier transform infrared analysis (FTIR), elementary analysis, and GPC‐MALLS‐viscometer analyses verified the incorporation of PB‐b‐PDMS and the grafting structure in the resulting polymer. Scanning electron microscope (SEM), bound rubber testing, and dynamic mechanical analysis demonstrated that the graft‐modification with PB‐b‐PDMS improved silica dispersity in the 1,2‐PB matrix because the incorporation of siloxane groups provided stronger interfacial interaction with silica. Meanwhile, the graft‐modified 1,2‐PB exhibited lower Mooney viscosity, higher tensile strength, and lower heat build‐up than unmodified 1,2‐PB. This concept provides novel inspiration for the preparation of advanced rubber with promoted silica compatibility and mechanical performance.

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Study on damping properties of HVBR/EVM blends prepared by in situ polymerization

Cited by 56 publications

References 11 publications

Curing of a tetrafluoroethylene–propylene elastomer with high‐vinyl polybutadiene rubber and peroxide

Curing of a tetrafluoroethylene–propylene elastomer with high‐vinyl polybutadiene rubber and peroxide

Molecular Insights Into Chain Length Effects of Hindered Phenol on the Molecular Interactions and Damping Properties of Polymer‐Based Hybrid Materials

Preparation and properties of 1,2‐polybutadiene grafting with poly(1,3‐butadiene)‐block‐(dimethylsiloxane)

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