Silsesquioxanes

Baney, Ronald H.; Itoh, Mai; Sakakibara, Akihito; Suzuki, Toshio

doi:10.1021/cr00037a012

Cited by 1,532 publications

(1,261 citation statements)

References 29 publications

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“…Silicone fluids with different viscosities are often found in personal care products [6]. Silsesquioxane resins with desirable electrical, optical, and mechanical properties have been widely applied as electrically insulating coatings or protective coatings against heat or abrasion [7,8].…”

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confidence: 99%

Endgroup-assisted siloxane bond cleavage in the gas phase

Chen

2003

J. Am. Soc. Mass Spectrom.

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ϩ . The formation of SiC 5 H 16 NO ϩ involves dissociation of a Si™O bond and formation of an O™H bond through rearrangement. The fragmentation mechanism was investigated utilizing ab initio calculations and Fourier transform ion cyclotron resonance (FTICR) mass spectrometry in combination with hydrogen/deuterium (H/D) exchange reactions. Sustained off-resonance irradiation collision-induced dissociation (SORI-CID) studies of the fully deuterated ion D 2 N(CH 2 ) 3 SiOSi(CH 2 ) 3 ND 3 ϩ provided convincing evidence for a backbiting mechanism which involves hydrogen transfer from the terminal amine group to the oxygen to form a silanol-containing species. Theoretical calculations indicated decomposition of H 2 N(CH 2 ) 3 SiOSi(CH 2 ) 3 NH 3 ϩ through a backbiting mechanism is the lowest energy decomposition channel, compared with other alternative routes. Two mechanisms were proposed for the fragmentation process which leads to the siloxane bond cleavage and the SORI-CID results of partially deuterated precursor ions suggest both mechanisms should be operative. Rearrangement to yield a silanol-containing product ion requires end groups possessing a labile hydrogen atom. Decomposition of disiloxane ions with end groups lacking labile hydrogen atoms yielded product ions from direct bond cleavages. (J

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confidence: 99%

Endgroup-assisted siloxane bond cleavage in the gas phase

Chen

2003

J. Am. Soc. Mass Spectrom.

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“…[14][15][16][17][18][19][20][21][22][23][24] It is reported that POSS exists in the following structures: random, ladder, cage, and partial cage. 25,26 POSS can be incorporated into polyurethanes by physical blending and chemical modifications. According to the number of groups at the eight corners of POSS molecules, chemical modifications can be divided into copolymerization, grafting, and crosslinking.…”

Section: Introductionmentioning

confidence: 99%

POSS/Polyurethane Hybrids and Nanocomposites: A Review on Preparation, Structure and Performance

Diao¹,

Mao²,

Zhang³

et al. 2015

Elastomers and Composites

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Polyhedral oligomeric silsesquioxane (POSS) is an important inorganic-organic hybrid material with a threedimensional structure. Polyurethane (PU) is a widely applied polymer that has versatile properties with the change of two phase structure. When POSS is incorporated into PU by physical or chemical methods, many properties can be greatly improved, such as mechanical properties, thermal stability, biodegradation resistance, and water resistance. This paper reviews the recent progress in preparation, structure, and performance of POSS-modified polyurethane from the viewpoint of physical blending and chemical modification.

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“…In the modification, the properties of the incorporated components are provided to the PSQs in addition to thermal stability and weatherability from the inorganic polysiloxane backbone. [1][2][3][4][5][6][7] Therefore, graft polymerization from or onto PSQ is an effective method to create useful hybrid materials. Consequently, various combinations of polymeric components and PSQs have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of grafted polysilsesquioxane by ring-opening polymerization of lactide and trimethylene carbonate

Kashio

Sugizaki

Tanaka

et al. 2011

Polym J

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The polysilsesquioxane (PSQ) containing 3-aminopropyl and phenyl groups (APSQ) was prepared from the corresponding trimethoxysilanes by co-condensation under basic conditions. The amino groups on APSQ were used as the initiator species for the graft polymerization of 1,3-trimethylene carbonate (TMC) and L-(-)-lactide (LA). The ring-opening polymerization of TMC and LA in the presence of the catalytic 1-trimethylsilylimidazole proceeded effectively to afford the PSQ with poly(TMC) and/or poly(LA) as the graft chains. The grafted PSQ containing poly(LA) showed the heat durability as an advantage of the hybrid polymer. In differential scanning calorimetry analysis, the grafted random copolymer of TMC and LA showed no clear endotherm corresponding to melting point (T m ). For the poly(LA)-grafted PSQ, the peak indicating T m was observed in the first heating run, but the corresponding peak was very small in the second run.

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Silsesquioxanes

Cited by 1,532 publications

References 29 publications

Endgroup-assisted siloxane bond cleavage in the gas phase

Endgroup-assisted siloxane bond cleavage in the gas phase

POSS/Polyurethane Hybrids and Nanocomposites: A Review on Preparation, Structure and Performance

Synthesis of grafted polysilsesquioxane by ring-opening polymerization of lactide and trimethylene carbonate

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