Preparation and characterization of 3-chloropropyl polysiloxane-based heat-curable silicone rubber using polyamidoamine dendrimers as cross-linkers

Dong, Fuying; Diao, Shen; Ma, Depeng; Zhang, Shengyou; Feng, Shun

doi:10.1016/j.reactfunctpolym.2015.09.005

Cited by 24 publications

(23 citation statements)

References 31 publications

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“…Figure provides the cure curve of torque versus curing time at 160°C for MCSR/MATTPS. It shows that the torque increases with the curing time and reaches the maximum at a certain curing time, which is similar to our previous studies of MCSR and the typical cure curve of rubber reported in previous literature . This result suggests that the cross‐linking networks are formed via the chemical cross‐linking reaction of amino groups with γ ‐chloropropyl groups during curing.…”

Section: Resultssupporting

confidence: 90%

“…The TG and DTG curves of the representative MCSR/ATPS (MCSR/ATPS‐2) in nitrogen are also illustrated in Figures and , respectively. Two degradation stages can be observed in the thermal behaviors of MCSR/MATTPS‐2 during heating in nitrogen, which is similar to the degradation profiles of MCSR cured with the cross‐linkers in our previous studies . Thus, it can be inferred that MCSR cured with different kinds of cross‐linkers exhibit the same degradation mechanism in nitrogen: The first degradation step was mainly attributed to the depolymerization of CPPS, whereas the second degradation step at temperatures above 600°C was mainly attributed to the breakdown of cross‐links .…”

Section: Resultssupporting

confidence: 82%

“…Furthermore, it can be also found in Tables and that the mechanical properties of MCSR/MATTPS, especially the tear strength, are much better than those of MCSR/ATPS. It have been confirmed that the formation of concentrative cross‐linking in the networks of silicone rubber can significantly improve the mechanical properties . Thus, the difference of mechanical properties between MCSR/MATTPS and MCSR/ATPS is attributed to the concentrative cross‐linking formed in the networks of MCSR/MATTPS.…”

Section: Resultsmentioning

confidence: 69%

“…We have confirmed that PAMAM dendrimer exhibits steric hindrance that renders parts of N–H bonds in the dendritic structure of PAMAM difficult to react with γ ‐chloropropyl groups . To obtain the optimal mechanical properties in MCSR/PAMAM, the amount of PAMAM should be added with r = 1.5.…”

Section: Resultsmentioning

confidence: 79%

“…Thus, this novel curing method offers a facile and inexpensive route to the preparation of HTV silicone rubber. To explore it for practical application, several polyamine compounds with various architectures were developed as cross‐linkers of CPPS for preparing MCSR, including polyamidoamine dendrimers, siloxane polyamidoamine dendrimers, aminopropyl‐modified silica, and amine‐functionalized polyhedral oligosilsesquioxane . The results of these researches further demonstrate the feasibility of using this novel curing method as a simple, convenient route for preparing HTV silicone rubber with excellent properties.…”

Section: Introductionmentioning

confidence: 96%

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Applications of α, ω‐telechelic polydimethylsiloxane as cross‐linkers for preparing high‐temperature vulcanized silicone rubber

Dong

Wang

et al. 2019

Polymers for Advanced Techs

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Multiamino‐terminated telechelic polydimethylsiloxane (MATTPS) was synthesized via aza‐Micheal reaction and amidation reaction and subsequently employed as cross‐linkers of polysiloxane containing γ‐chloropropyl groups (CPPS) for preparing a series of high‐temperature vulcanized silicone rubber (MCSR/MATTPS). The curing, mechanical, and thermal properties of MCSR/MATTPS were studied through rheometry, mechanical testing, and thermogravimetric analysis (TGA). MCSR/MATTPS exhibits optimal mechanical properties with a tensile strength of 9.52 MPa and tear strength of 45.4 kN/m when the molar ratio of [N–H]/[CH2CH2CH2Cl] is of 1, which is attributed to the formation of concentrative cross‐linking in the three‐dimensional polymer networks. The thermal behaviors of MCSR/MATTPS display a two‐step weight loss process by heating in nitrogen whereas more than two weight loss process in air. TGA results indicate that the introduction of aliphatic long chain and carbonyl groups in the structure of MATTPS has little negative effect on the thermal stability of MCSR/MATTPS.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 96%

See 3 more Smart Citations

Applications of α, ω‐telechelic polydimethylsiloxane as cross‐linkers for preparing high‐temperature vulcanized silicone rubber

Dong

Wang

et al. 2019

Polymers for Advanced Techs

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Improvement the flame retardancy, thermal conductivity and mechanical properties of silicone rubber via silane coupling agent modified CNTs‐β‐FeOOH

Zhang

Fan

et al. 2023

J of Applied Polymer Sci

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Silicone rubber with its odorless and non-toxic, high and low temperature resistance and other advantages is widely used in many fields, but its shortcomings of flammability and low thermal conductivity limit its application and development. Therefore, the research on flame retardant and thermal conductive silicone rubber is practically valueable. In this study, iron oxyhydroxide (β-FeOOH) was synthesized on carbon nanotubes (CNTs) by in situ growth and added to silicone rubber after surface modification with γ-aminopropyltriethoxysilane (KH550).The results showed that the limiting oxygen index (LOI) of methyl vinyl silicone rubber (VMQ) with the addition of one part of KH550@CNTs-β-FeOOH increased to 29.8%, its peak heat release rate (pHRR) and total heat release (THR) decreased by 40.1% and 30.2%, respectively, and its thermal conductivity increased to 0.3680 W/mÁk. The flame-retardant performance and thermal conductivity of the VMQ composite were significantly improved. The improvement of its flame retardancy was mainly due to the catalytic carbonization of CNTs and β-FeOOH, which promoted the formation of dense carbon layers. The carbon layer insulates the exchange of oxygen and combustible gases. In addition, the thermal conductive network constructed by KH550@CNTs-β-FeOOH in the composite effectively improved the thermal conductivity of VMQ.

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Preparation and characterization of silicone rubber through the reaction between γ‐chloropropyl and amino groups with siloxane polyamidoamine dendrimers as cross‐linkers

Dong

Feng

et al. 2017

Polymers for Advanced Techs

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A novel heat-curable silicone rubber (MCSR/Si-PAMAM) was prepared by using siloxane polyamidoamine (Si-PAMAM) dendrimers as cross-linkers and polysiloxane containing γchloropropyl groups as gums. The chemical cross-linking occurs through the reaction between Si-PAMAM dendrimers and polysiloxane containing γ-chloropropyl groups. The effect of various amounts of cross-linkers on mechanical properties of MCSR/Si-PAMAM was discussed in this paper. MCSR/Si-PAMAM exhibits favorable mechanical properties with a tensile strength of 10.06 MPa and a tear strength of 47.9 kN/m when the molar ratio r of [N-H]/[CH 2 CH 2 CH 2 Cl] is 1:1. These excellent mechanical properties can be attributed to the formation of concentrative cross-linking from Si-PAMAM dendrimers in the cross-linking networks, along with the introduction of Si-O-Si units in the internal structure of dendrimers. The introduction of Si-O-Si unitsreduces the steric hindrance of molecular structure, which facilitates the N-H bonds in the interior layers of dendrimers to react with γ-chloropropyl groups. In addition, thermogravimetric analysis results indicate that MCSR/Si-PAMAM is thermally stable even at high temperatures in a nitrogen atmosphere. Differential scanning calorimetry analysis reveals that the glass transition peak of MCSR/Si-PAMAM is not identified in the temperature range −150 to −30°C, only a melting endothermic peak at −40°C.

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Preparation and characterization of 3-chloropropyl polysiloxane-based heat-curable silicone rubber using polyamidoamine dendrimers as cross-linkers

Cited by 24 publications

References 31 publications

Applications of α, ω‐telechelic polydimethylsiloxane as cross‐linkers for preparing high‐temperature vulcanized silicone rubber

Applications of α, ω‐telechelic polydimethylsiloxane as cross‐linkers for preparing high‐temperature vulcanized silicone rubber

Improvement the flame retardancy, thermal conductivity and mechanical properties of silicone rubber via silane coupling agent modified CNTs‐β‐FeOOH

Preparation and characterization of silicone rubber through the reaction between γ‐chloropropyl and amino groups with siloxane polyamidoamine dendrimers as cross‐linkers

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