Synthesis of Grafted Polysilsesquioxane by Ring-Opening Polymerization of Lactide

Kashio, Mikihiro; Sugizaki, Toshio; Yamamoto, Shinichi; Moriya, Osamu

doi:10.1295/polymj.pj2008307

Cited by 3 publications

(13 citation statements)

References 24 publications

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“…An analogous copolymer composition was observed in the grafting of LA with e-CL from APSQ. 14 In this example, the content of the unit due to e-CL in the graft chain was smaller than that due to LA. This difference demonstrates that LA acts as a retardant in the ring-opening copolymerization.…”

Section: Graft Polymerization From Polysilsesquioxane M Kashio Et Almentioning

confidence: 73%

“…APSQ was prepared by the reported method. 14 The M n and M w /M n of the obtained APSQ were 1600 and 1.120, respectively. The contents of phenyl and aminopropyl groups, estimated by 1 H-NMR data, were 1.27 mmol equiv g À1 and 5.33 mmol equiv g À1 , respectively.…”

Section: Experimental Procedures Generalmentioning

confidence: 93%

“…The presence of poly(TMC) also affected the crystallization of poly(LA), as expected. 14,24 The GrPLC1 curve shows an undetectable peak for T m , even in the first heating run. The results demonstrate that the incorporation of TMC units changes the crystallinity of the graft chains containing LA units.…”

Section: Thermal Propertiesmentioning

confidence: 97%

“…The content of the monomer unit was estimated from 1 H-NMR data. In the estimation, the content of the lactic acid unit, shown in a previous report, 14 was counted as the monomer unit from LA.…”

Section: Experimental Procedures Generalmentioning

confidence: 99%

“…[8][9][10][11][12] We have previously investigated the grafting of the biodegradable polymers e-caprolactone (CL) and L-(-)-lactide (LA) from the PSQ main chain containing phenyl and aminopropyl groups (APSQ). 13,14 In thermal analyses of the resultant PSQs, low crystallinity of the polymeric components seems to be induced by the presence of the polysiloxane structure. This property is favorable for the use of grafted PSQs as practical hybrids.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Graft Polymerization From Polysilsesquioxane M Kashio Et Almentioning

confidence: 73%

Section: Experimental Procedures Generalmentioning

confidence: 93%

Section: Thermal Propertiesmentioning

confidence: 97%

Section: Experimental Procedures Generalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Preparation and dispersibility of poly(L‐lactide)‐grafted silica nanoparticle

Takamura

Yamauchi

Tsubokawa

2011

J of Applied Polymer Sci

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To improve dispersibility of silica nanoparticle in organic solvents, the grafting of poly(L-lactide) (PLLA) onto silica nanoparticle surface by ring-opening polymerization of L-lactide (LA) was investigated in the presence of an amidine base catalyst. The ring-opening polymerization of LA successfully initiated in the presence of silica having amino groups (silica-NH 2 ) and an amidine base catalyst to give PLLA-grafted silica, but not in the presence of untreated silica (silica-OH). In the absence of the amidine base catalyst no ring-opening polymerization of LA even in the presence of silica-NH 2 and no grafting of PLLA onto silica were observed. It became apparent that the amidine base catalyst acts as an effective catalyst for the ring-opening graft polymerization of LA from the surface of silica-NH 2 . In addition, it was found that the percentage of PLLA grafting onto silica could be controlled according to the reaction conditions. The average particle size of PLLA-grafted silica was smaller than that of silica-NH 2 . Therefore, it was considered that the aggregation structure of silica nanoparticles was considerably destroyed by grafting of PLLA onto the surface. The PLLAgrafted silica gave a stable dispersion in polar solvents, which are good solvents for PLLA.

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Catalysts for Isocyanate-Free Polyurea Synthesis: Mechanism and Application

et al. 2016

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Synthesis of Grafted Polysilsesquioxane by Ring-Opening Polymerization of Lactide

Cited by 3 publications

References 24 publications

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

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

Preparation and dispersibility of poly(L‐lactide)‐grafted silica nanoparticle

Catalysts for Isocyanate-Free Polyurea Synthesis: Mechanism and Application

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