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Poly(gamma-glutamic acid)-silica hybrids with fibrous structure: effect of cation and silica concentration on molecular structure, degradation rate and tensile properties

机译:具有纤维结构的聚(γ-谷氨酸)-二氧化硅杂化物:阳离子和二氧化硅浓度对分子结构,降解速率和拉伸性能的影响

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Biodegradable organic/inorganic hybrid fibremats were prepared by electrospinning using poly(gamma-glutamic acid) (gamma-PGA) and glycidoxypropyl trimethoxysilane (GPTMS) for application in bone tissue engineering. Ca(OH)(2) was used for preparing the calcium salt form of gamma-PGA (Ca-gamma PGA), which is water-soluble. Effects of the amount of Ca(OH)(2) mixed with gamma-PGA on the chemical structure and characteristics of resulting hybrid fibremats were studied. ATR-FTIR data indicated that cross-linking between gamma-PGA chains was achieved due to the coupling reaction between the polymer side chain and epoxy terminated group of GPTMS and silica network formation between GPTMS molecules. C-13 CP/MAS-NMR and Si-29 MAS-NMR spectra indicated that open epoxy groups in GPTMS reacted with each other and the rate of condensation between its silanol groups was lower when the added amount of Ca(OH)(2) was smaller. Tensile test data demonstrated that elongation to failure was improved for the hybrid fibremat in comparison with just Ca-gamma PGA fibremats.
机译:通过使用聚(γ-谷氨酸)(γ-PGA)和环氧丙氧基丙基三甲氧基硅烷(GPTMS)进行电纺丝来制备可生物降解的有机/无机杂化纤维,用于骨组织工程。 Ca(OH)(2)用于制备水溶性的γ-PGA(Ca-γPGA)的钙盐形式。研究了Ca(OH)(2)与γ-PGA混合的量对所得混合纤维的化学结构和特性的影响。 ATR-FTIR数据表明,γ-PGA链之间的交联是由于聚合物侧链与GPTMS的环氧封端基团之间的偶联反应以及GPTMS分子之间的二氧化硅网络形成而实现的。 C-13 CP / MAS-NMR和Si-29 MAS-NMR光谱表明,当添加Ca(OH)(2)时,GPTMS中的开放环氧基相互反应,并且其硅烷醇基之间的缩合速率较低。较小。拉伸测试数据表明,与仅Ca-γPGA纤维相比,混合纤维的断裂伸长率得到了改善。

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