Hydrolytic Degradation of Aliphatic Polyesters Copolymerized with Poly(ethylene glycol)s

Nagata, Minoru; Kiyotsukuri, Tsuyoshi; Takeuchi, Shigeki; Tsutsumi, Naoto; Sakai, Wataru

doi:10.1002/(sici)1097-0126(199701)42:1<33::aid-pi655>3.0.co;2-9

Cited by 41 publications

(28 citation statements)

References 2 publications

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“…Water absorption increases rapidly at a higher PEG content. A similar behavior has been observed for PET20 copolymers and poly(1,4‐butanediol succinate) copolymers with PEG,21 which probably relates to the fact that the PEG component forms the continues phase above about 60 wt% of PEG 22…”

Section: Resultssupporting

confidence: 75%

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Single Crystalline Na_0.7MnO₂ Nanoplates as Cathode Materials for Sodium‐Ion Batteries with Enhanced Performance

Wang

Ahn

et al. 2013

Chemistry A European J

198

123

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Single crystalline rhombus-shaped Na(0.7)MnO2 nanoplates have been synthesized by a hydrothermal method. TEM and HRTEM analyses revealed that the Na(0.7)MnO2 single crystals predominantly exposed their (100) crystal plane, which is active for Na(+)-ion insertion and extraction. When applied as cathode materials for sodium-ion batteries, Na(0.7)MnO2 nanoplates exhibited a high reversible capacity of 163 mA h g(-1), a satisfactory cyclability, and a high rate performance. The enhanced electrochemical performance could be ascribed to the predominantly exposed active (100) facet, which could facilitate fast Na(+)-ion insertion/extraction during the discharge and charge process.

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Section: Resultssupporting

confidence: 75%

“…However, at the higher PEG content (⩾ 20 mol%), the additional reduction of T m 's was hardly observed although the PEG contents increased, which demonstrates that these copolymers are the segmented block type. We have reported20 the similar T m depressions for the block copolymers on the basis of poly(ethylene terephthalate) (PET) and PEGs.…”

Section: Resultsmentioning

confidence: 90%

Single Crystalline Na_0.7MnO₂ Nanoplates as Cathode Materials for Sodium‐Ion Batteries with Enhanced Performance

Wang

Ahn

et al. 2013

Chemistry A European J

198

123

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“…Generally, it is well known that PEO is a hydrophilic and non-degradable polymer while PL is a hydrophobic and biodegradable polymer of which ester group hydrolyzed during hydrolytic degradation. [17][18][19] Therefore, the following mechanism could be proposed to account for degradation pattern of copolymer composed with PEO and PL. When introduced in aqueous medium, firstly the copolymer absorbs water by influence of PEO and then hydrolytic cleavage of PL blocks starts immediately at random.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and degradation behaviors of PEO/PL/PEO tri-block copolymers

Lee

Kim

et al. 2002

Macromol. Res.

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Poly(ethylene oxide)/polylatide/poly(ethylene oxide) (PEO/PL/PEO) tri-block copolymers, which each block is connected by ester bond, were synthesized by coupling reaction of PL with PEO in the presence of pyridine. PL/PEO/PL tri-block copolymer was synthesized by ring opening polymerization of L-lactide initiated by PEO in the presence of stannous octoate. Degradation behavior of the copolymers was investigated in a pH 7.4 phosphate buffer saline (PBS) at 37· 1 o C. Gel permeation chromatography (GPC) and 1 H-nuclear magnetic resonance (NMR) were used to monitor the change of mass loss, molecular weight and composition of copolymers. In hydrolytic degradation, the PEO/PL/PEO tri-block copolymer with high PEO contents affected the increase of its mass loss, and resulted in the decrease of its molecular weight as well as PEO composition. However, when PL/PEO/PL and PEO/PL/PEO tri-block copolymers had similar PEO contents, PEO/PL/PEO decreased faster in molecular weight and PEO composition than PL/PEO/PL.

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“…Aliphatic polyesters from dicarboxylic acids and diols are generally synthesized by polycondensation. However, it is rather difficult to obtain high molecular weight polymers by polycondensation, [1][2][3] unless under highly reduced pressure and/or in the presence of some special catalysts. [4][5][6][7] Thus, high molecular weight polymers of dicarboxylic acids and diols are usually produced from chain extension of hydroxyl-telechelic prepolymers by using chain-extenders such as diisocyanates.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Aliphatic Polyesters via Ring‐Opening Polymerization of Macrocyclic Oligoesters

Nakayama

Sakaguchi

Tanaka

et al. 2015

Macromolecular Symposia

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Summary: To synthesize high molecular weight aliphatic polyesters, ring-opening polymerization (ROP) of macrocyclic oligoesters made from several dicarboxylic acids and diols was investigated. Macrocyclic oligoesters used for the ROP were synthesized in ca. 50% yield via polycondensation of dicarboxylic acids (small excess) and diols under dilute condition in toluene, followed by washing with aq. NaHCO 3 to remove linear oligomers. The obtained products were the mixtures of macrocyclic oligoesters with various ring size (dimer to heptamer). The polymerization of the macrocyclic oligoesters made from succinic acid and 1,4-butanediol using rare earth catalysts such as Nd(BH 3 )(thf) 3 and Nd(O i Pr) 3 was found to give high molecular weight polymers in good yields. Cyclic dimer of butylene succinate ((BS) 2 ) was isolated from the mixture of the cyclic oligomers by column chromatography, and was similarly polymerized by the rare earth catalysts. Bulk polymerization of (BS) 2 by Nd(BH 3 )(thf) 3 yielded poly(butylene succinate) with M n up to 38 000. Cyclic oligomers of trimethylene oxalate were not polymerized under the similar conditions applied in this study.

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Hydrolytic Degradation of Aliphatic Polyesters Copolymerized with Poly(ethylene glycol)s

Cited by 41 publications

References 2 publications

Single Crystalline Na_0.7MnO₂ Nanoplates as Cathode Materials for Sodium‐Ion Batteries with Enhanced Performance

Single Crystalline Na_0.7MnO₂ Nanoplates as Cathode Materials for Sodium‐Ion Batteries with Enhanced Performance

Synthesis and degradation behaviors of PEO/PL/PEO tri-block copolymers

Synthesis of Aliphatic Polyesters via Ring‐Opening Polymerization of Macrocyclic Oligoesters

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Hydrolytic Degradation of Aliphatic Polyesters Copolymerized with Poly(ethylene glycol)s

Cited by 41 publications

References 2 publications

Single Crystalline Na0.7MnO2 Nanoplates as Cathode Materials for Sodium‐Ion Batteries with Enhanced Performance

Single Crystalline Na0.7MnO2 Nanoplates as Cathode Materials for Sodium‐Ion Batteries with Enhanced Performance

Synthesis and degradation behaviors of PEO/PL/PEO tri-block copolymers

Synthesis of Aliphatic Polyesters via Ring‐Opening Polymerization of Macrocyclic Oligoesters

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Product

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Single Crystalline Na_0.7MnO₂ Nanoplates as Cathode Materials for Sodium‐Ion Batteries with Enhanced Performance

Single Crystalline Na_0.7MnO₂ Nanoplates as Cathode Materials for Sodium‐Ion Batteries with Enhanced Performance