Synthesis and characterization of novel room temperature vulcanized (RTV) silicone rubbers using octa[(trimethoxysilyl)ethyl]-POSS as cross-linker

Chen, Dongzhi; Yi, Shengping; Fang, Pengfei; Zhong, Yi; Huang, Chi; Wu, Xiaojun

doi:10.1016/j.reactfunctpolym.2010.12.010

Cited by 79 publications

(55 citation statements)

References 35 publications

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“…Therefore, POSS molecules are excellent fillers for preparing organic/inorganic hybrid materials with excellent interface action and without any surface modification in comparison to other inorganic nanoparticles, and for variety of architectures such as linear, pendant, branched, star‐shaped as well as network. In these hybrid materials, both inorganic and organic moieties are chemically bonded to each other and nanoscale POSS can be uniformly dispersed in the composites at molecular level to result in effective reinforcement of the thermal and mechanical properties of the materials . However, those previous researches were mostly limited to the linear or pendent polymeric systems using POSS macromers with only monofunctional corner group .…”

Section: Introductionmentioning

confidence: 99%

The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

Jiao

Wang

et al. 2014

Polym Eng Sci

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Octa‐vinyl polyhedral oligomeric silsesquioxane (V‐POSS) and octa‐(methacryloxy) propyl polyhedral oligomeric silsesquioxane (M‐POSS) were incorporated into PMMA to prepare POSS/PMMA hybrid materials at molecular level via in situ polymerization. The resulting hybrid materials showed only swelling instead of solution in ethyl acetate, while pristine PMMA completely dissolved in ethyl acetate; moreover, the M‐POSS/PMMA hybrid materials exhibited more excellent resistance to solvent stress cracking. An excellent transparency was observed for all hybrid materials. Incorporation of V‐POSS and M‐POSS significantly improved thermal properties of PMMA. The thermal decomposition temperature of hybrid materials was enhanced except a slightly compromised initial decomposition temperature. The hybrid materials prepared with 0.2–0.6 mol% M‐POSS or V‐POSS improved the reinforcing and toughening properties in comparison to pristine PMMA. Also, the incorporation of POSS decreased the dielectric constant and dielectric loss of the hybrid materials with more voids introduced into the composites no matter the structure of POSS. POLYM. ENG. SCI., 55:565–572, 2015. © 2014 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

Jiao

Wang

et al. 2014

Polym Eng Sci

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“…Recently, several groups used different kinds of vinyl POSS derivatives to vulcanize silanol terminated polydimethylsiloxane (PDMS) by hydrolytic condensation reaction or to react with hydride PDMS by addition‐type reaction as cross linking agents . The enhancement effect of POSS on mechanical properties, thermal stability and hardness was exhibited in comparison with pristine silicone rubber counterpart.…”

Section: Introductionmentioning

confidence: 99%

Liquid polyoctahedral silsesquioxanes as an effective and facile reinforcement for liquid silicone rubber

Sun

Kong

2018

J of Applied Polymer Sci

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Acrylo polyoctahedral silsesquioxanes (POSS), a liquid POSS derivative with reactive C=C double bond, is used to modify addition‐cured liquid silicone rubber (LSR) as an effective nanofiller for the first time. Significant enhancements on mechanical properties are obtained. With addition of only 1.5 parts per hundred rubbers (phr) of acrylo POSS to fumed silica‐strengthened silicones, the Young's modulus and ultimate tensile strength are increased by 432% and 66%, respectively, and the hardness of resulting LSR composites is improved as well. Proton nuclear magnetic resonance and Fourier transform infrared spectroscopies prove the efficient hydrosilylation between Acrylo POSS and hydrosiloxane directly. The thermal stability and morphology investigations also confirm that POSS is covalently incorporated into the network of silicone rubber. The increment of crosslink density is proved by extraction and swelling experiment and dynamic mechanical analysis. It can be envisioned that this simple and effective method could help produce high performance silicone rubber composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46996.

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“…Generally, multi-functional POSS derivatives behave as nanosized cross-linkers which take part in the formation of polymer networks [19,21,22] or as precursors in the production of amphiphilic materials [23].…”

Section: Introductionmentioning

confidence: 99%

Multi-Alkenylsilsesquioxanes as Comonomers and Active Species Modifiers of Metallocene Catalyst in Copolymerization with Ethylene

et al. 2018

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Abstract:The copolymers of ethylene (E) with open-caged iso-butyl-substituted tri-alkenyl-silsesquioxanes (POSS-6-3 and POSS-10-3) and phenyl-substituted tetra-alkenyl-silsesquioxane (POSS-10-4) were synthesized by copolymerization over the ansa-metallocene catalyst. The influence of the kind of silsesquioxane and of the copolymerization conditions on the reaction performance and on the properties of the copolymers was studied. In the case of copolymerization of E/POSS-6-3, the positive comonomer effect was observed, which was associated with the influence of POSS-6-3 on transformation of the bimetallic ion pair to the active catalytic species. Functionality of silsesquioxanes and polymerization parameters affected the polyhedral oligomeric silsesquioxanes (POSS) contents in the copolymers which varied in the range of 1.33-7.43 wt %. Tri-alkenyl-silsesquioxanes were incorporated into the polymer chain as pendant groups while the tetra-alkenyl-silsesquioxane derivative could act as a cross-linking agent which was proved by the changes in the contents of unsaturated end groups, by the glass transition temperature values, and by the gel contents (up to 81.3% for E/POSS-10-4). Incorporation of multi-alkenyl-POSS into the polymer chain affected also the melting and crystallization behaviors.

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Synthesis and characterization of novel room temperature vulcanized (RTV) silicone rubbers using octa[(trimethoxysilyl)ethyl]-POSS as cross-linker

Cited by 79 publications

References 35 publications

The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

Liquid polyoctahedral silsesquioxanes as an effective and facile reinforcement for liquid silicone rubber

Multi-Alkenylsilsesquioxanes as Comonomers and Active Species Modifiers of Metallocene Catalyst in Copolymerization with Ethylene

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