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Weng C.,China Jiliang University | Zhang H.,Hangzhou Cancer Hospital | Xiong X.,China Jiliang University | Lu X.,China Jiliang University | And 2 more authors.
Asian Journal of Chemistry | Year: 2014

The present short review about a great deal of researches have been dedicated to the development of the reaction (catalyzing the ring opening of epoxide with amines for the corresponding amino-alcohols) in recent years. Source


Wang L.-S.,CAS Chengdu Institute of Organic Chemistry | Wang L.-S.,University of Chinese Academy of Sciences | Chen H.-C.,CAS Chengdu Institute of Organic Chemistry | Zhang L.-F.,CAS Chengdu Institute of Organic Chemistry | And 3 more authors.
Journal of Polymer Research | Year: 2011

A biodegradable and thermoplastic elastomer-poly(L-lactide-co-ε- caprolactone) (PLLCA) - was reinforced with 5, 10, 20, and 30 wt% of CaCO 3whiskers. We assessed the influence of the CaCO3whisker content on the mechanical and thermal properties of the PLLCA/CaCO 3whisker composites. Scanning electron microscopy (SEM) revealed that the CaCO3whiskers were uniformly distributed in the composite matrices. The results of differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) showed that the glass transition temperatures (Tg) of the composites increased slightly with increasing CaCO3whisker content. At low CaCO3whisker contents, the tensile strengths of the composites increased sharply with increasing CaCO3content, the Young's moduli also increased, and the elongation at break values gradually decreased. Thermogravimetric analysis (TGA) showed that the CaCO 3whiskers can promote the thermal degradation of PLLCA. Shape memory test results indicated that an appropriate amount of CaCO3whiskers can improve the shape memory properties of PLLCA. © Springer Science+Business Media B.V. 2010. Source


Wang L.-S.,CAS Chengdu Institute of Organic Chemistry | Wang L.-S.,Chinese Academy of Sciences | Chen H.-C.,CAS Chengdu Institute of Organic Chemistry | Xiong Z.-C.,CAS Chengdu Institute of Organic Chemistry | And 2 more authors.
Materials Letters | Year: 2010

Considering the mechanical properties and shape-memory properties, we developed a novel biodegradable compound shape-memory-polymer blend composed of poly (l-lactide-co-ε-caprolactone) (PLLCA) and poly (l-lactide-co-glycolide) (PLLGA). In comparison with most reported shape-memory blends, our blend showed outstanding shape-memory properties at higher stationary-phase concentrations (more than 50% w/w). The results of scanning electron microscopy (SEM) demonstrated the immiscibility between PLLCA and PLLGA. The tensile test results revealed that blends with different PLLGA concentrations showed different mechanical properties. The results of the shape-memory tests suggested that the blends showed improved recovery and fixing performances with an increase in the PLLGA content, especially at PLLGA concentrations greater than 50 wt.%. © 2009 Elsevier B.V. All rights reserved. Source


Liuyun J.,CAS Chengdu Institute of Organic Chemistry | Chengdong X.,CAS Chengdu Institute of Organic Chemistry | Dongliang C.,CAS Chengdu Institute of Organic Chemistry | Lixin J.,CAS Chengdu Institute of Organic Chemistry | And 2 more authors.
Applied Surface Science | Year: 2012

Three different surface modification methods for nano-hydroxyapatite (n-HA) of stearic acid, grafted with l-lactide, combining stearic acid and surface-grafting l-lactic were adopted, respectively. The surface modification reaction and the effect of different methods were evaluated by Fourier transformation infrared (FTIR), X-ray photoelectron spectra (XPS), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM). The results showed that n-HA surfaces were all successful modified, and the modification method of combining stearic acid and surface-grafting l-lactic had the greatest grafting amount and the best dispersion among the three modification methods. Then, the n-HA with three different surface modification and unmodified n-HA were introduced into PLGA, respectively, and a serials of n-HA/PLGA composites with 3% n-HA amount in weight were prepared by solution mixing, and the properties of n-HA/PLGA composites were also investigated by electromechanical universal tester and scanning electron microscope(SEM), comparing with PLGA. The results showed that the n-HA/PLGA composite with the n-HA surface modified by combining stearic acid and surface-grafting l-lactic had the highest bending strength and the best dispersion and interfacial adhesion among the three different modification methods, suggesting the surface modification of combining stearic acid and surface-grafting l-lactic was the most ideal method in this study, which has a great deal of enhancement of bending strength than PLGA, and it would be potential to be used in the field of bone fracture internal fixation in future. Crown Copyright © 2012 Published by Elsevier B.V. All rights reserved. Source


Wang L.-S.,CAS Chengdu Institute of Organic Chemistry | Wang L.-S.,University of Chinese Academy of Sciences | Chen H.-C.,CAS Chengdu Institute of Organic Chemistry | Xiong Z.-C.,CAS Chengdu Institute of Organic Chemistry | And 2 more authors.
Macromolecular Materials and Engineering | Year: 2010

In this paper, a new, completely biodegradable shapememory elastomer comprising PLLCA reinforced by in situ PGA fibrillation is described. The effects of PGA content, screw speed and draw ratio on the average diameter of PGA Acknowledgements: This project was financially supported by Bureau of Life Sciences and Biotechnology of the Chinese Academy of Sciences, and the Science and Technology Department of Zhejiang Province, China (2008C11126). © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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