Silylethylene elastomers

Nametkin, N. S.; Вдовин, В.М.; Zav'yalov, V.I.

doi:10.1016/0032-3950(65)90146-2

Cited by 8 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…'*'* Poly(silmethy1ene)s have the simplest polymer structure among polycarbosilane family, and a number of research activities, almost all of which were focused on the polymerization methods, have been found in l i t e r a t~r e . '~-~~ In spite of the above situation, few reports have been published dealing with thermally stable poly(silmethy1ene)s. It has been reported by Nametkin and co-workers that poly(diphenylsilmethy1ene) (PDPSM) synthesized by thermal ring-opening polymerization is a crystalline polymer with the melting temperature of 340°C, 21 but other properties such as thermal and mechanical properties have not been reported. We have recently demonstrated that several types of Cu catalysts were effective for polymerization of 1)1,3,3-tetraaryl-1,3-disilacyclobutanes, and investigated the basic physical properties of the resulting poly(diarylsilmethy1ene)s (PDArSMs; [Ar2SiCH2],) with phenyl or tolyl groups on Si atoms.…”

Section: Introductionmentioning

confidence: 99%

Poly(diarylsilmethylene)s, II. Thermal and mechanical properties1

Ogawa

Murakami

1996

J. Polym. Sci. B Polym. Phys.

View full text Add to dashboard Cite

Thermal and mechanical properties of poly(diarylsilmethylene)s (PDArSMs) with phenyl, m‐tolyl or p‐tolyl substituents on Si atoms were investigated. According to the TG‐DTA, poly(diphenylsilmethylene) (PDPSM) remained almost unchanged in weight up to about 400°C, and showed two‐step weight loss in the temperature range between ca. 400 and 700°C in an air atmosphere. The first decomposition step seems assignable to elimination of aryl groups while the second one is presumably due to oxidative decomposition which is evident from a large exothermic peak in the DTA trace. Thermostability of PDArSMs with tolyl groups were comparable to that of PDPSM when the measurement was conducted under nitrogen, whereas the polymers having tolyl substituents were highly thermally unstable in air compared with PDPSM. These polymers exhibited a gain in weight accompanied with a violent exothermic reaction in the early stage of thermal decomposition in air. This thermal instability of the tolyl‐substituted polymers can be explained by high sensitivity of the tolyl groups toward oxidative decomposition. Analysis of pyrolyzed products of PDArSMs suggested that these polymers underwent radical cleavage of Si‐aryl bonds to provide network materials which can be precursors for Si‐containing ceramics. Mechanical properties of PDPSM are also discussed. © 1996 John Wiley & Sons, Inc.

show abstract

Section: Introductionmentioning

confidence: 99%

Poly(diarylsilmethylene)s, II. Thermal and mechanical properties1

Ogawa

Murakami

1996

J. Polym. Sci. B Polym. Phys.

View full text Add to dashboard Cite

show abstract

“…One route involves the ring-opening polymerization (ROP) of the correspondingly substituted disilacyclobutane. This method works best for alkyl- and phenyl-substituted disilacyclobutanes .…”

Section: Introductionmentioning

confidence: 99%

“…Both routes rely on the use of disilacyclobutane compounds as monomers. Unfortunately, the preparation of the required disilacyclobutanes can be problematic, involving a multistep procedure with low to moderate overall yields. 3d, This represents a serious obstacle to the full development of this new and interesting class of polymers and their prospective application as functional polymeric materials.…”

Section: Introductionmentioning

confidence: 99%

Modification of a Hyperbranched Hydridopolycarbosilane as a Route to New Polycarbosilanes

et al. 1997

View full text Add to dashboard Cite

A general method for introducing various side chains onto a highly branched polysilaethylene (HBPSE) backbone is described. This method starts with a commercial oligomer mixture which has a highly branched structure, consisting of [H3SiCH2], [SiH2CH2], [SiH(CH2)2], and [Si(CH2)3] subunits combined to give an overall "SiH2CH2" average formula. Several alkyl-, aryl-, and allyl-substituted HBPSEs were prepared by first converting the parent HBPSE into a highly reactive bromo-substituted derivative which was then treated with organolithium reagents (RLi, R ) C4H9, C6H13, C8H17, C6H5, C6H4N(Me)2) or Grignard reagents (RMgBr, R ) Et, allyl). The parent HBPSE and its derivatives were characterized by means of NMR and IR spectroscopy, as well as elemental analysis, DSC, GPC, and VPO. It was shown that the allyl-substituted HBPSE can be used as a synthetic platform for attaching functional side chains via the hydrosilation reaction.

show abstract

“…This ROP has been carried out both thermally and catalytically with various platinum complexes and other latetransition-metal compounds. [11][12][13][14][15][16][17][18] Anionic polymerization of silacyclobutanes employing alkyllithiums has also been used successfully to prepare certain polycarbosilanes; however, in the case of the DSCBs this method has received relatively little attention in the literature. [19][20][21][22] For the transitionmetal-catalyzed polymerization, the most likely mechanism appears to involve oxidative addition of the mono-or di-silacyclobutane to the metal [most likely Pt(0)] to form a metallocyclic intermediate which presumably then goes on to react with more monomer, either to expand the ring or to grow a linear polycarbosilane chain from the metal center.…”

Section: The Poly(silylenemethylene)s (Psms)mentioning

confidence: 99%

“…In the initial studies of the PSMs obtained by ROP, the silicon substituents were relatively simple alkyl or aryl groups and little effort was made to examine the stereochemical consequences of different silicon substituents or to investigate crystallization. [11][12][13][14][15][16][17][18] Indeed, except for poly(dimethylsilylenemethylene), which was the first PSM to receive attention and for which only glass formation has been evidenced on cooling, until quite recently very little attention has been directed to the investigation of the detailed molecular structure and ordering phenomena in these polymers. In the last few years, in addition to the work described below, various other groups have contributed to a growing interest in such PSMs.…”

Section: The Poly(silylenemethylene)s (Psms)mentioning

confidence: 99%

Linear and hyperbranched polycarbosilanes with Si-CH2-Si bridging groups: A synthetic platform for the construction of novel functional polymeric materials

Interrante

Rushkin

Shen

1998

Appl. Organometal. Chem.

View full text Add to dashboard Cite

Work carried in the authors' laboratory on Si-CH 2-Si bridged polycarbosilanes is reviewed. In pursuit of high-yield polymeric precursors to silicon carbide, convenient synthetic routes to both linear and hyperbranched polycarbosilanes having a '[SiH 2 CH 2 ] n ' compositional formula have been developed. The linear [SiH 2 CH 2 ] n polymer was prepared by ring-opening polymerization of a substituted disilacyclobutane, and was studied both as an analogue of polyethylene and as a high-yield precursor to SiC. Elaboration of the methods employed to prepare this polymer has yielded a wide range of new poly(silylenemethylene)s (PSMs) of the type [SiRR'CH 2 ] n , where R and R' can be a wide range of different groups, including a series of symmetrically disubstituted polymers with R = R' = F, alkyl and alkoxy which form crystalline solid phases and various amorphous, atactic polymers having different R and R' groups. By using (Si)-Cl replacement reactions analogous to those developed previously for polydichlorophosphazene, as well as hydrosilation reactions similar to those used for [Si(H)(Me)O] n , a series of side-chain polymers having various groups attached to Si through Si-C or Si-O bonded linkages were obtained. Similar polymer modification reactions have recently been developed for the branched oligomer/polymer analogue of these linear polycarbosilanes, leading to hyperbranched species with functional substituents, including a di(ethyleneoxy) methyl ether-terminated derivative which readily dissolves lithium salts. The results of studies of these novel 'inorganic/organic' hybrid polycarbosilanes are described and their properties are compared with those of related carbon-backbone and siloxane polymers.

show abstract

Silylethylene elastomers

Cited by 8 publications

References 0 publications

Poly(diarylsilmethylene)s, II. Thermal and mechanical properties1

Poly(diarylsilmethylene)s, II. Thermal and mechanical properties1

Modification of a Hyperbranched Hydridopolycarbosilane as a Route to New Polycarbosilanes

Linear and hyperbranched polycarbosilanes with Si-CH2-Si bridging groups: A synthetic platform for the construction of novel functional polymeric materials

Contact Info

Product

Resources

About