Crosslink network evolution of BIIR/EPDM blends during peroxide vulcanization

Wang, Jin‐Yuan; Pan, Sanshui; Zhang, Yong; Guo, Sharon

doi:10.1016/j.polymertesting.2016.12.034

Cited by 33 publications

(27 citation statements)

References 23 publications

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“…Crosslinking densities of MPU and PU coatings with different filler contents were measured by the balanced swelling method. As shown in Equation ) below 31,43 :

\frac{V_{italicro}}{V_{italicrf}} = 1 - \frac{mΦ}{1 - Φ},

where V ro and V rf stand for volume percent of polymer in the swelling polymer without filler and with filler, respectively. Φ presents volume percent of filler in polymer before swelling.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and characterization of modified castor oil via photo‐click chemistry forUV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

Dai

Song

Zhang

2020

J of Applied Polymer Sci

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A castor oil (CO) was modified via thiol-ene click chemistry reaction between CO and 3-mercaptopropyl trimethoxysilane, with the conversion of C C bonds of CO over 99% based on 1 HNMR spectra. The obtained modified castor oil (MCO) was used as a biobased polyol to prepare waterborne polyurethane (WPU) dispersions. The modification of CO exhibited a great effect on the properties of WPU dispersions and coatings, and an obvious change is the improvement of the water resistance of WPU coatings. WPU dispersions with MCO had good storage stability. A WPU coating with 7% MCO had high surface hydrophobicity, and its water absorption was as low as 3.2%. Conductive carbon black filled WPU coatings with MCO were cured by efficient UV radiation, and their conductive percolation threshold could decrease to 0.76%, which could be attributed to the well filler dispersion and strong filler-polymer interaction. The WPU dispersions are ecofriendly, and can be used to produce biobased WPU coatings with a great application potential in antistatic coating fields.

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“…Crosslinking densities of MPU and PU coatings with different filler contents were measured by the balanced swelling method. As shown in Equation ) below 31,43 :

\frac{V_{italicro}}{V_{italicrf}} = 1 - \frac{mΦ}{1 - Φ},

where V ro and V rf stand for volume percent of polymer in the swelling polymer without filler and with filler, respectively. Φ presents volume percent of filler in polymer before swelling.…”

Section: Resultsmentioning

confidence: 99%

“…Crosslink density was measured according to the literatures. 30,31 Briefly, coatings were immersed in toluene at 25 C for 72 h. Then coatings were dried under vacuum to remove solvent completely.…”

Section: Characterizationmentioning

confidence: 99%

Preparation and characterization of modified castor oil via photo‐click chemistry forUV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

Dai

Song

Zhang

2020

J of Applied Polymer Sci

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“…Through the application of organic peroxides as curing agents for elastomer compounds, rubber chain segments are connected together with carbon‐carbon cross‐links. The main benefits of peroxide‐cured vulcanizates are higher thermal stability and good resistance to thermo‐oxidative ageing . However, they usually have worse tensile and tear strength and inferior elastic and dynamic properties.…”

Section: Introductionmentioning

confidence: 99%

Rubber magnets based on NBR and lithium ferrite with the ability to absorb electromagnetic radiation

Kruželák

Kvasničáková

Ušák

et al. 2020

Polymers for Advanced Techs

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Rubber magnetic composites were prepared through the incorporation of magnetic soft lithium ferrite into acrylonitrile butadiene rubber. Standard sulfur-based curing and peroxide curing systems were used for cross-linking of rubber matrices. The experimental part was focused on the investigation of ferrite content and curing system composition on cross-link density, physical-mechanical, magnetic and shielding characteristics of composites. The results demonstrated that cross-link density and physical-mechanical properties of composites can be modified by both the amount of ferrite and composition of the curing system. The influence of curing systems on magnetic properties was negligible. It can be stated that the application of lithium ferrite to rubber matrix leads to the preparation of rubber composites with the ability to efficiently absorb harmful electromagnetic radiation in the tested frequency range. The shielding efficiency of composites increased with increasing content of magnetic filler. K E Y W O R D S electromagnetic radiation shielding, magnetic filler, peroxide curing, rubber magnets, sulfur curing

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“…As C C cross-links have higher bonding energy when compared to sulfidic linkages, the main benefit of peroxide cured vulcanizates are good resistance to thermo-oxidative aging and high thermal stability. 14,16,17 Although, the tensile properties are usually poorer than those of sulfur cured elastomers. For that reason, multifunctional organic compounds with low molecular weight and activated double bonds are often used to improve vulcanization process of rubber compounds with organic peroxides.…”

Section: Introductionmentioning

confidence: 99%

Low frequency electromagnetic shielding efficiency of composites based on ethylene propylene diene monomer and multi‐walled carbon nanotubes

Kruželák

Kvasničáková

Plavec

et al. 2020

Polymers for Advanced Techs

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Ethylene propylene diene monomer rubber was filled with multi-walled carbon nanotubes to prepare composite materials with the effect of electromagnetic radiation (EMR) shielding. Sulfur-based curing system as well as peroxide curing system were used for vulcanization of rubber compounds. The main goal of the work was the investigation of curing system composition and filler content on curing process, physical-mechanical properties, cross-link density, and shielding efficiency of the prepared composites. The results showed that curing characteristics and cross-link density of composites were dependent on both, amount of carbon nanotubes and curing system composition. The incorporation of filler resulted in the enhancement of physical-mechanical properties of composites. Higher values of tensile strength were found to have composites cured with organic peroxide in combination with coagent. The achieved results also demonstrated that carbon nanotubes filled rubber composites are suitable candidates for applications, in which shielding of EMR at low frequencies is based on reflection.

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Crosslink network evolution of BIIR/EPDM blends during peroxide vulcanization

Cited by 33 publications

References 23 publications

Preparation and characterization of modified castor oil via photo‐click chemistry forUV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

Preparation and characterization of modified castor oil via photo‐click chemistry forUV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

Rubber magnets based on NBR and lithium ferrite with the ability to absorb electromagnetic radiation

Low frequency electromagnetic shielding efficiency of composites based on ethylene propylene diene monomer and multi‐walled carbon nanotubes

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