共查询到20条相似文献,搜索用时 156 毫秒
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以氧化淀粉为交联剂交联明胶、以氯化钙为交联剂交联海藻酸钠,采用分步交联的方法制备了海藻酸钠/明胶互穿网络膜.通过红外光谱仪表征了氧化淀粉、海藻酸钠/明胶互穿网络膜的结构;研究了氧化淀粉的氧化度对互穿网络膜力学性能、热稳定性能、微观形貌、交联度、吸水保水性能等各种性能的影响.结果表明,随着氧化淀粉氧化度的增加,互穿网络膜的拉伸强度、断裂伸长率、交联度呈现先增加后降低的趋势,氧化度为60%的氧化淀粉交联制备的互穿网络膜的以上性能达到最大值;吸水保水性能呈现先降低后增加的趋势,这主要是因为随着互穿网络膜交联度的增加,使两相间形成了均匀、致密的网络结构,两者分子链上大量的羟基和羧基受到束缚,导致互穿网络膜吸水率、保水率的下降.同时也说明了该体系的交联度并不是随着氧化淀粉氧化度的提高而逐渐提高,对于该体系氧化淀粉存在最佳氧化度. 相似文献
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甲基丙烯酰胺基明胶(GelMA)水凝胶的制备及其在生物医学领域的应用是最近十几年的研究热点。GelMA水凝胶因其独特的光致交联特性,可以加工成不同形貌的水凝胶支架材料,同时,因其具有可控的力学性能、降解性能,以及优秀的生物相容性,已成为具有广泛应用前景的生物高分子聚合物材料。本文主要介绍了GelMA水凝胶在止血材料、创伤敷料、组织工程支架、药物控释、骨缺损修复等领域的研究进展。 相似文献
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聚乳酸(PLA)类材料以其独特的生物相容性和生物可降解性备受关注。将其两种旋光对映体,即PLLA与PDLA共混,会产生一种具有更高熔点的立体复合物(sc-PLA),并能提高聚合物的结晶度、结晶速率以及耐热性,对于PLA类材料的开发和应用具有重要意义。本文从结晶机理、球晶形态、热稳定性和降解性能等方面综述了近年来有关sc-PLA结构与性能的研究进展,并对sc-PLA研究方向提出了作者的观点。 相似文献
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Cheorun Jo Hojin Kang Na Young Lee Joong Ho Kwon Myung Woo Byun 《Radiation Physics and Chemistry》2005,72(6):745-750
Agricultural by-products, pectin and gelatin, were used to prepare a biodegradable film. The film casting solution including the pectin and gelatin was irradiated at 0, 10, 20, and 30 kGy to investigate the irradiation effect on the mechanical properties of the film. The tensile strength of the 10 kGy-irradiated film was the highest among the treatments but the elongation at break, water vapour permeability, and swelling ratio were the lowest. Hunter color L*- and a*-values decreased but the b*-value increased as the irradiation dose increased. The total organic carbon content produced from the Paenibacillus polymyxa and Pseudomonas aeruginosa also showed that the film of 10 kGy-irradiated was lower than those of 0, 20, and 30 kGy-irradiated films. In conclusion, irradiation of the film casting solution at 10 kGy increased the mechanical properties of the pectin and gelatin based film. To manufacture the film by agricultural by-products, however, the irradiation dose of the film casting solution should be determined to achieve better mechanical properties. 相似文献
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Fabrication of silk fibroin film with properties of thermal insulation and temperature monitoring 下载免费PDF全文
Liang Zhao Hao Wang Jie Luo Cheng Cai Guo L. Song Guo Y. Tang 《Journal of Polymer Science.Polymer Physics》2016,54(18):1846-1852
Silk fibroin exhibits excellent mechanical properties, good biocompatibility, and biodegradability combined with benign processing conditions, attracting considerable research interest for the application as biomedical materials. Among the diverse forms of sponges, hydrogels, films, and mats manufactured from silk fibroin, films are especially appealing due to the high water and oxygen permeability, good cell attachment, and low immunogenicity. Fabrication of silk fibroin films with novel properties has been successfully developed simply by incorporating various functional components into it. In the present study, the properties of thermal insulation and temperature monitoring for the silk fibroin film are demonstrated for the first time through the incorporation of thermochromic microcapsules within it. Moreover, the silk fibroin film is also endowed with improved mechanical properties in terms of tension strength and elongation at break because of the reinforcing effect of thermochromic microcapsules. The silk fibroin film fabricated with novel features in this study can be a good candidate for the application of wound dressings, tissue engineering scaffolds, and bio‐related devices in the future. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1846–1852 相似文献
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QIN Chang DONG Jing XIE Beibei WANG Hongkun ZHANG Na ZHAO Chunhua QIAO Congde LIU Mingxia YANG Xiaodeng LI Tianduo 《高等学校化学研究》2023,39(2):290-295
Poly(lactic-co-glycolic acid)(PLGA) is one of the most representative degradable copolymers and promising drug carriers. In the current paper, the PLGAs with a lactic acid/ glycolic acid(LA/GA) molar ratio of 52/48 and various molecular weights were prepared by a melting method. The molecular weight, molecular weight distribution, and thermal stability were determined by 1H NMR and thermogravimetric analysis methods. The results demonstrated that PLGAs with the fixed LA/GA molar ratio(52/48), different molecular weights, and narrow molecular weight distribution could be obtained by solely altering the reaction time. The PLGA films were prepared, and their properties including micro-structure, mechanical property, in-vitro cytotoxicity, and biodegradability were characterized. In combination with the homogeneous microstructures and mechanical properties, the drug-loading and releasing properties of PLGA3.2 films were investigated. The results show that PLGA3.2 film with an LA/GA molar ratio of 52/48 is a promising curcumin carrier. 相似文献
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ZHOU Zheng ZHOU Fu-gui ZHANG Shu-ling MU Jian-xin YUE Xi-gui WANG Gui-bin 《高等学校化学研究》2012,28(5):907-911
Two types of antioxidants(a primary antioxidant and a secondary antioxidant) were used to improve the stability of poly(ether ether ketone)(PEEK). The effects of the antioxidants on the properties of PEEK and the stabilization mechanism were investigated by some characterization methods, such as rheometer, thermogravimetric ana- lysis(TGA), universal tester and electron spin resonance(ESR). The results indicate that the efficiency of the phosphorous antioxidant(DS) in improving the stability of PEEK was better than that of the phenolic antioxidant(DN) in both melting stability and thermal stability, and the thermal stability of PEEK sample containing 0.07%(mass fraction) DS was the best among all the samples due to the decrease of the free radicals density, as proven by ESR measurement. Additionally, no obvious changes could be observed in mechanical properties of PEEK containing antioxidants compared to those of virgin PEEK. 相似文献
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E. M. Abdel Bary Ahmed Fekri Yaser A. Soliman 《International Journal of Polymer Analysis and Characterization》2018,23(2):156-169
The purpose of this work was to improve the biodegradable properties of polyvinyl alcohol (PVA)/nanowood flour membranes consisting of nanosilica which were manufactured by compression molding process. Cross-linking of PVA was used to improve the mechanical properties and prevent high solubility of the obtained transient membranes. Plasticizer used to increase the plasticity of transient membranes. The biodegradability of transient membranes was evaluated under UV accelerated weathering as well as soil burial test. The transient membranes were characterized by Fourier transform infrared spectra and X-ray diffraction to study the chemical structure. Mechanical strength was appointed to characterize and reveal the mechanical, thermal analysis and the structural properties of such transient membranes. Scanning electron microscope was used to characterize the morphology of transient membranes. Swelling test and weight loss due to biodegradation were also evaluated. The results showed that the developed transient membranes can be used as food packaging bags due to biodegradability (weight loss) under irradiation and during burial soil which making them environmentally friendly. 相似文献
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Water resistance, mechanical properties and biodegradability of methylated-cornstarch/poly(vinyl alcohol) blend film 总被引:1,自引:0,他引:1
The main shortcomings of biodegradable starch/poly(vinyl alcohol) (PVA) film are hydrophilicity and poor mechanical properties. With an aim to overcome these disadvantages, cornstarch was methylated and blend films were prepared by mixing methylated-cornstarch (MCS) with PVA. The mechanical properties, water resistance and biodegradability of the MCS/PVA film were investigated. It was found that MCS/PVA film had higher water resistance than the native starch/PVA film. However, the water resistance of MCS/PVA films did not have significant difference with the increase in the degree of substitution (DS) of the methylated starch from 0.096 to 0.864. Enzymatic, microbiological and soil burial biodegradation results indicated that the biodegradability of the MCS/PVA film strongly depended on the starch proportion in the film matrix. The degradation rate of starch in the starch/PVA film was hindered by blending starch with PVA. Both tensile strength and percent elongation at break of the MCS/PVA film were improved as DS of the methylated starch increased. Conversely, increasing the methylated starch proportion in film matrix deteriorated both tensile strength and percent elongation at break of the film. 相似文献
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Corrado Berti Paola Marchese Francesco Di Credico Sophie Commereuc 《European Polymer Journal》2008,44(11):3650-3661
In order to improve the thermal and mechanical properties of the poly(butylene 1,12-dodecanedioate), some novel aliphatic-aromatic random copolyesters have been prepared by starting from 1,4-butanediol and different molar ratio of 1,12-dodecanedioc acid and terephthalic acid. The samples were characterized by 1H NMR and the molecular structure was correlated with the crystalline phase present, the level of crystallinity, the glass transition temperature, the mechanical behavior, and the biodegradability. In particular, the copolymer containing the 70 mol% of PBT repeating units notably improves the thermal and mechanical properties of the poly(butylene 1,12-dodecanedioate) towards those of PBT and maintains a very high thermal stability, but loses the biodegradability of the poly(alkylene dicarboxylate). Therefore, for this class of aliphatic-aromatic copolymers the chemical composition must be carefully chosen to reach a compromise between good thermal and mechanical performances and biodegradability, according to the necessity. 相似文献
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B. Venkatram C. Kailasanathan P. Seenikannan S. Paramasamy 《International Journal of Polymer Analysis and Characterization》2016,21(7):647-656
Composite materials, made by replacing traditional materials, are used because of their capability to produce tailor-made, desirable properties such as high tensile strength, low thermal expansion, and high strength to weight ratio. The need for the development of new materials is essential and growing day by day. The natural sisal/general polymer (GP) reinforced with nanoclay composites has become more attractive due to its high specific strength, light weight, and biodegradability. In this study, sisal–nanoclay composite is developed and its mechanical properties such as tensile strength, flexural strength, and impact strength are evaluated. The interfacial properties, internal cracks, and internal structure of the fractured surface are evaluated using scanning electron microscope. The thermal disintegration of composites are evaluated by thermogravimetric analysis. The results indicate that the incorporation of nanoclay in sisal fiber/GP can improve its properties and can be used as a substitute material for glass fiber-reinforced polymer composites. 相似文献
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壳聚糖水杨酸盐-明胶共混膜结构表征及其抗菌性 总被引:13,自引:0,他引:13
以溶液共混法成功制备出壳聚糖水杨酸盐-明胶共浊膜,用FT-IR、XRD、SEM表征了其结构,并测试了其吸水率,力学性能及抑菌性能。结果表明,壳聚糖水杨酸盐-胶胶共混膜中存在强烈的氢键相互作用及良好相容性,共混膜的力学性能随明胶含量增大而明显提高,当明胶含量为30%时,共混膜的抗张强度最大,其干、湿态抗张强度分别达99.9MPa和34.9MPa,比纯壳聚糖膜干,湿态抗张强度分别提高了99.8%有83.75,共浊膜抑菌性随明胶含量增加而下降,但其抑菌性仍明显高于壳聚糖膜。水杨酸的引入有利于改善其力学性能及抗菌性能,该共漫漫经膜作为一种潜在的伤口包扎材料,将具有广阔应用前景。 相似文献