Poly(silaethylene): A Novel Analog of Polyethylene

Interrante, L. V.; Wu, H.-J.; Apple, T.; Shen, Qionghua; Ziemann, B.; Narsavage, D. M.; Smith, K.

doi:10.1021/ja00105a072

Cited by 38 publications

(28 citation statements)

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“…Differences in physical properties observed between these types of polymers are mainly due to the different bond lengths of the Si1C bond and the C1C bond. Recently, a number of studies have been devoted to the comparison of carbon-based polymers with their respective carbosilane analogs [8,9]. Figure 1 gives segments of a poly(isobutylene) (PIB) and a poly(dimethylsilylenemethylene) (PDMSM) chain as well as the respective bond lengths.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of polymer blends of poly(isobutylene) and poly(dimethylsilylenemethylene)

et al. 1998

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The phase behavior of blends of poly(isobutylene) (PIB) having different molecular weights and its carbosilane analog poly(dimethylsilylenemethylene) (PDMSM) is studied by optical microscopy, differential scanning calorimetry (DSC) and pressure—volume—temperature (PVT) measurements. DSC and microscopy measurements reveal that PDMSM with Mw = 721000 g/mol is miscible at all blend ratios with a PIB of Mw = 1500 g/mol, and immiscible at virtually all blend ratios and temperatures with PIBs of higher molecular weight. PVT measurements of the neat blend components are evaluated in terms of the Flory—Orwool—Vrij equation‐of‐state and Patterson theory. Free volume and interactional contributions to the overall χ parameter are of comparable size, but have opposing trends in temperature dependence. This leads to a χ(T) function that does not obey the proportionality between χ and 1/T observed for systems with dominating repulsive enthalpic interactions. The miscibility as a function of blend ratio and molecular weight is successfully described by the Patterson theory with the parameter X12 = 0.4 J/cm3.

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Section: Introductionmentioning

confidence: 99%

Thermodynamics of polymer blends of poly(isobutylene) and poly(dimethylsilylenemethylene)

et al. 1998

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“…[1][2][3][4][5][6] High thermal stability, good electrical resistance, low surface tension, excellent release and lubrication properties, high hydrophobicity, low glass transition, and low toxicity for the natural environment all are attractive properties. [7][8][9][10] Although such hybrid copolymers are difficult to prepare, research conducted by McGrath, [11][12][13][14][15][16][17][18][19][20][21] Weber, and Interrante [43][44][45][46][47][48][49] has been instrumental in defining viable synthetic routes towards these materials.…”

Section: Introductionmentioning

confidence: 99%

Chain‐End and Chain‐Internal Crosslinking in “Latent Reactive” Silicon Elastomers

Matloka

Sworen

Zuluaga

et al. 2005

Macro Chemistry & Physics

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Summary: Latent reactivity has been employed to create processable elastomers constructed of carbosilane and either carbosiloxane or polyether segments. Two types of latent modes have been introduced: “chain‐internal” and “chain‐end” sites through the use of labile silicon methoxy and trifunctional olefinic functionalities. These latent reactive sites remain inert during formation of the linear copolymer; subsequent exposure to moisture triggers hydrolysis of the methoxy group and formation of a chemically crosslinked thermoset. These “chain‐end” sites limit the formation of dangling chains improving the overall mechanical properties of the material. The thermoset's mechanical response can be potentially varied from plastic to elastic behavior, depending on the ratio of hard and soft monomers employed. The concentration of “chain‐internal” and “chain‐end” crosslink sites enhances strength; modification to the run length and structure of the soft phase enhances elasticity, generating samples having moduli of 6 MPa, tensile strengths of 0.6 MPa and elongations of 400%.“Latent reactive” silicon elastomer.magnified image“Latent reactive” silicon elastomer.

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“…The poly(silylenemethylene)s (PSMs, [SiRR′CH 2 ] n ),1–15 and their hyperbranched analogues,1,2,15 have attracted considerable interest in recent years as a novel class of hybrid inorganic/organic polymers, as well as for use as precursors to silicon carbide. Among the potential advantages that this class of polymers may offer compared with other inorganic/organic hybrid polymers are a combination of low glass transition temperature ( T g ), high synthetic versatility (similar to that of polyphosphazenes and polysiloxanes), and good chemical stability similar to that of the polyolefins 1,2.…”

Section: Introductionmentioning

confidence: 99%

“…The crystalline structures of the PDASMs have recently been studied by X‐ray, electron diffraction (ED), and molecular modeling 12,13. The fiber X‐ray data and the electron diffraction pattern of single crystals show that the PDASMs have an all‐ gauche conformation in the main chain, giving a 4 1 helical structure in contrast to the unsubstituted polymer, poly(silaethylene) [SiH 2 CH 2 ] n (PSE), which has an all‐ trans conformation 4,7. There is one chain with two monomer units in the unit cell and one turn of a 4 1 helical structure consisting of the SiCSiC atoms of two monomer units in the main chain.…”

Section: Introductionmentioning

confidence: 99%

Packing Studies on Poly(di‐n‐alkylsilylenemethylene)s

Park

Interrante

Farmer

2003

Macromol. Rapid Commun.

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The packing of poly(di‐n‐alkylsilylenemethylene) (PDASMs) chains was studied by using X‐ray, electron diffraction, and molecular modeling methods. X‐ray and electron diffraction measurements revealed unit cells in which the PDASMs were efficiently packed. The PDASM with the longer alkyl side chains, such as poly(di‐n‐propylsilylenemethylene) (PDPrSM), showed packing with the alkyl side chains interlocked with each other like cross‐shaped gears in the two‐dimensional monoclinic unit cell. The PDASM with the shorter ethyl substituent, poly(di‐n‐ethylsilylenemethylene) (PDESM), showed a lack of ability to interlock its side chains due to the short length of the alkyl groups. In these studies, we found that the length of the alkyl side chains could change the packing arrangement of PDASMs from monoclinic to orthorhombic to hexagonal with only short‐range order as the alkyl side chain length decreases at room temperature.

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Poly(silaethylene): A Novel Analog of Polyethylene

Cited by 38 publications

References 0 publications

Thermodynamics of polymer blends of poly(isobutylene) and poly(dimethylsilylenemethylene)

Thermodynamics of polymer blends of poly(isobutylene) and poly(dimethylsilylenemethylene)

Chain‐End and Chain‐Internal Crosslinking in “Latent Reactive” Silicon Elastomers

Packing Studies on Poly(di‐n‐alkylsilylenemethylene)s

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