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1.
对甘油锌用作PVC光稳定剂的光稳定作用进行了研究,考察了PVC紫外光老化后力学性能和颜色的变化。结果表明,甘油锌对PVC具有明显的光稳定作用,与受阻胺光稳定剂Tinuvin770复配,具有明显的正协同效应,当二者的质量配比达到2∶3 时,对PVC的光稳定效果最佳。  相似文献   
2.
A micro-envioment for nerve cells and tissue growth were designed and constructed via surface modification of poly(L-lactide-co-glycolide)(PLGA) with chitosan and hydroxyapatite(HA). The poly(L-lactide-co-glycolide)/chitosan/hydroxyapatite (PLGA/chitosan/HA) conduits were manufactured by a combined solvent casting and particulate leaching technique. The conduits were highly porous with an interconnected pore structure and 76.5% porosity. Micropores with 50–100 micrometer diameter were formed in the conduits. In vivo application of PLGA/chitosan/HA conduits for reconstruction of 10 mm sciatic nerve defect was assessed by the walking track analysis, the quantifying of the wet weight of tibialis anterior muscle and the histological assessment. The conduits in host rats in vivo can not only be an effective in promoting regenerating of nerves but can also lead to favorable nerve functional recovery. Funded by the National Natural Science Foundation of China(No.50774096)  相似文献   
3.
甘油锌的合成及其光稳定作用研究   总被引:2,自引:0,他引:2  
介绍了甘油锌配合物的合成方法,研究了影响产物合成的主要因素,测试了产品的红外光谱、物化性能及光稳定作用。结果表明:在甘油与氧化锌质量比为7:1,260℃及0.5gZA作用下反应1.5h得到的甘油锌不仅光稳定性能好,而且无毒、不着色。  相似文献   
4.
铕三元配合物的合成、表征及其光致发光性能   总被引:1,自引:0,他引:1  
以苯甲酸、邻苯二甲酸、间苯二甲酸、水杨酸、丙烯酸、甲基丙烯酸、α—噻吩基三氟甲酰丙酮为第一配体,二安替比林甲烷,三正辛基氧化膦、2,2’-联吡啶、邻菲咯啉及邻菲咯啉N-氧化物为第二配体,合成了系列铕三元配合物。经元素分析确定了它们的组成;研究了它们的紫外吸收光谱、红外吸收光谱及荧光光谱。紫外光谱的研究表明,配合物的紫外吸收主要表现为配体的吸收,但是吸收峰的位置发生了移动;红外光谱的研究表明,配合物的红外光谱不同于自由配体的红外光谱,在400~500 cm-1出现了吸收峰,这是Eu-O的伸缩振动峰;荧光光谱的研究表明,第二配体的加入可以显著提高配合物的荧光性能。  相似文献   
5.
新型盐酸缓蚀剂的研究   总被引:2,自引:0,他引:2  
合成了一种新型盐酸缓冲剂—— β—二乙胺基丙酰苯 (简称 DPB) ,并用失重法、极化曲线法研究了其缓蚀性能。结果表明 ,DPB在盐酸中对碳钢有良好的缓蚀作用 ,是一种混合控制型缓蚀剂  相似文献   
6.
A new method of fabricating porous polymer scaffolds was developed, using sodium hydrogen carbonate particulates as the porogen to foam. The pore structure of polymer scaffolds can easily be manipulated by controlling the size and weight fraction of sodium hydrogen carbonate particulates. The scaffolds are highly porous with a porosity greater than 90% and with a larger pore size ranging from 100-400μm, and are well distributed with the interconnected and open pore wall structure which is necessary for tissue engineering. We investigated the effect of the porosity of scaffolds, the pore size of scaffolds and material of polymer on the mechanical properties of scaffolds. The scaffolds fabricated by the method have more big pores than those by the convenient method of salt leaching.  相似文献   
7.
Poly(L-lactide-co-caprolactone)(85-15)[P(LLA-CL)(85-15)] was synthesized from high purity L-lactide and ε-caprolactone using tin octoate as initiator by ring-opening polymerization, and characterized by infrared spectrum and 1H-NMR spectrum. The synthesized P(LLA-CL)(85-15) is a random copolymer. The influences of polymerization temperature, polymerization time, dosage of initiator and polymerization pressure on the weight average molecular weight and the polydispersity index of P(LLA-CL)(85-15) were investigated. The optimum preparation conditions of P(LLA-CL)(85-15) are: the polymerization pressure is less than 0.5 Pa, the polymerization temperature is 130 ℃, the n(M)/n(I) ratio is 8 000/1, and the polymerization time is 36 h. Under the condition, the weight-average molecular weight of prepared P(LLA-CL)(85-15) is 65.6×104, and molecular weight distribution coefficient is 1.15.  相似文献   
8.
甘油锌用作PVC热稳定剂的研究   总被引:1,自引:0,他引:1  
运用刚果红试纸法、热烘箱老化实验法和流变仪试验,以硬脂酸锌作对比,对甘油锌配合物(简称甘油锌)用作聚氯乙烯(PVC)热稳定剂的热稳定作用进行了研究,并对甘油锌的复配进行了研究;还研究了稳定剂对 PVC 耐候性的影响。结果表明,甘油锌与硬脂酸钙在质量比为1.0/1.5时具有较好的协同作用,甘油锌/硬脂酸钙与环氧大豆油和亚磷酸三苯酯质量比为1.0/1.5/0.2/0.2时有较好的协同效应;所研究的甘油锌/硬脂酸钙复合热稳定剂对PVC 具有较好的热稳定作用,PVC 与复合热稳定剂质量比为100.0/2.9时,PVC 的刚果红试验热稳定时间达25 min、热烘老化试验热稳定时间达130 min。另外,研究发现环氧大豆油和亚磷酸三苯酯对硬脂酸锌/硬脂酸钙复合热稳定剂也有较好的协同效应。  相似文献   
9.
1 INTRODUCTION In recent years, much attention has been focused on biodegradable and biocompatible polymers. Among biodegradable biomaterials, poly-L-lactide(PLLA) is a widely used polymer[1?2]. PLLA is currently used in medicine, including drug delivery systems and hard tissue scaffolds. For hard tissue scaffolds, a certain strength is demanded due to the coordination of strength loss and tissue healing rate to support loading after all degradation of the implant[3]. Many studies on c…  相似文献   
10.
功能梯度材料的设计与制备以及性能评价   总被引:11,自引:0,他引:11  
阐述了功能梯度材料设计、制备及性能评价的国内外研究现状, 并着重分析了功能梯度材料物性参数预测模型、热应力模拟与计算、梯度组成分布优化设计以及各种制备方法的优劣对比, 最后对功能梯度材料存在的问题及前景进行了探讨。同时指出, 功能梯度材料性能评价需建立合适的评价标准, 随着制备技术的不断完善、应用范围不断扩大, 功能梯度材料在材料科学中广阔的应用前景必将受到应有的重视。鉴于功能梯度材料的制造方法具有很强的目的性、理论性、工艺性及实用性, 研究宜从基础入手, 兼顾其它应用技术, 广泛开展横向联合, 将基础理论研究、材料设计、工艺制造及性能测试很好地结合, 以促进功能梯度材料技术的发展。  相似文献   
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