Synthesis and Properties of Polycarbosilanes by Hydrosilylation Polymerization

Tsumura, Manabu; Iwahara, Takahisa; Hirose, Toshifumi

doi:10.1295/polymj.27.1048

Cited by 19 publications

(10 citation statements)

References 10 publications

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“…Preparation of PCS Oligomers (Table ). Various PCS oligomers were prepared by hydrosilylation polymerization in the same manner as our previous work. , …”

Section: Methodsmentioning

confidence: 99%

Silicon-Based Interpenetrating Polymer Networks (IPNs): Synthesis and Properties

et al. 1998

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Both “condensation” and “hydrosilylation” reactions have been successfully applied for the synthesis of silicon-based interpenetrating polymer networks (IPNs) consisting of a stable Si−O and Si−C linkage. We adopted a ladder silsesquioxane oligomer (LDS 1; commercial name, Glass Resin GR100) and a polycarbosilane (PCS) by hydrosilylation polymerization of bifunctional Si−H and Si−vinyl monomers as the two components for the IPN. The combined LDS/PCS curing system was studied to try to obtain homogeneously cured material, which may lead to IPN formation, by using both reactions selectively in one pot for chain-extending and cross-linking of both components, respectively. We synthesized the cured LDS/PCS; LDS/PCS = 8/2, 5/5, and 2/8 [wt/wt]. Tuning the rates of the two reactions to each other was important for obtaining a transparent cured product. The morphology of the cured LDS/PCS (8/2) was examined by TEM and AFM. TEM analysis showed a good miscibility with an nm level of LDS/PCS (8/2). The thermal and mechanical properties of the LDS/PCS (8/2) cured sample were better than the calculated values from each component's value. The experimental data imply the IPN structure of the cured LDS/PCS.

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“…Preparation of PCS Oligomers (Table ). Various PCS oligomers were prepared by hydrosilylation polymerization in the same manner as our previous work. , …”

Section: Methodsmentioning

confidence: 99%

Silicon-Based Interpenetrating Polymer Networks (IPNs): Synthesis and Properties

et al. 1998

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“…However, the linear PCS oligomer, which was caused to react between the monomers (1) and (3), was insoluble in common organic solvents. 13 Therefore, the crosslinked PCS via in situ chain extending and crosslinking reaction of the PCS monomers (1), (3), and the crosslinking agent (2) were synthesized (Scheme 1, PCS B). The curing reaction was performed with a casting method heating stepwise (50/80/100/150°C).…”

Section: Effects Of the Molecular Weight Between The Cross/inkingmentioning

confidence: 99%

Synthesis and Properties of Crosslinked Polycarbosilanes by Hydrosilylation Polymerization

Tsumura

Iwahara

1999

Polym J

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The aim of this investigation is the development of crosslinked polycarbosilanes (PCSs) with excellence on mechanical properties. Crosslinked polycarbosilanes were obtained by using a hydrosilylation curing reaction between multi-functional vinylsilanes and hydrosilanes. The PCSs were prepared with a casting method from the monomer solution, The mechanical properties and the glass transition temperatures (T.s) of the PCSs were measured by a flexural test and Diflerential Scanning Calorimetry (DSC), 29 Si solid-state NMR spectroscopy was employed for estimating the conversion of the vinylsilanes. The effects of the following three points on the mechanical properties of the crosslinked PCSs were evaluated: (I) the molecular weight between the crosslinking points, (2) the introduction of !lexural units, and (3) the network chain density. The mechanical properties and r.s of the PCSs were found to be dependent on the structures of the monomer used. It was clear that both the high network chain density and the rigid-rod unit, [ Me 2 Sip -C6 H 4-Me2Si CH 2 CH2-], are favorable to high mechanical properties. The improvement in strength can be related to the structures of vinylsilancs and hydrosilanes used. KEY WORDS Polycarbosilane! Crosslinked Polymer/ Hydrosilylation Cure/ 29 Si Solid-State Nuclear Magnetic Resonance j Network Chain Density I Mechanical and Thermal Property! Rigid-Rod Polymer I

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“…Furthermore, the resultant polycarbosilanes are endued with outstanding solubility and high thermal stability after introduction of phenyl rings in the side groups because the atom of chiral center in the main chain can decrease the crystallinity. [7] More recently, 1,1-diphenylethylene (DPE) and its derivatives have been widely used for quantitative synthesis of the in-chain and chain-end functionalized polymers. [8] Because its special structure has remarkable steric hindrance, DPE cannot be homopolymerized with conventional chain growth polymerization method.…”

Section: Introductionmentioning

confidence: 99%

Preparation of functionalized precursor of SiC ceramic via hydrosilylation polymerization of 1,1-diphenylethylene derivatives

Sang

Wang

et al. 2015

Designed Monomers and Polymers

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Polycarbosilanes were prepared via hydrosilylation polymerization of functional 1,1-diphenylethylene (DPE) derivatives (dimethyl-[4-(1-phenylvinyl)phenyl]silane (DPE-SiH) and 1-(4-methyloxyphenyl)-1′-(4-dimethylsilanephenyl) ethylene (DPE-SiH/OMe)). Both DPE-SiH and DPE-SiH/OMe were synthesized as monomers and then utilized to prepare corresponding oligomers with Si-C bonds and phenyl rings in their backbones. The DPs were calculated to be 5.9 and 6.3, respectively, while the β-additions were 88.8 and 88.0%. The Td 5 of DPE-SiH and DPE-SiH/OMe oligomers were 270 and 345°C, respectively, and their weight residue was approximately 20% even heated at a temperature near 1200°C in nitrogen. The compact tiny pores distributed on cross section of the resultant SiC ceramics were observed with the scanning electron microscopy. The thermal analyses verified that the oligomers of DPE-SiH and DPE-SiH/OMe possessed favorable thermal stabilities and could be taken as the proper PCSs precursor for preparation of SiC ceramic materials.

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Synthesis and Properties of Polycarbosilanes by Hydrosilylation Polymerization

Cited by 19 publications

References 10 publications

Silicon-Based Interpenetrating Polymer Networks (IPNs): Synthesis and Properties

Silicon-Based Interpenetrating Polymer Networks (IPNs): Synthesis and Properties

Synthesis and Properties of Crosslinked Polycarbosilanes by Hydrosilylation Polymerization

Preparation of functionalized precursor of SiC ceramic via hydrosilylation polymerization of 1,1-diphenylethylene derivatives

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