氧氟沙星-壳聚糖-明胶共混膜的制备及表征

制备了壳聚糖 明胶共混膜 ,测定了壳聚糖 明胶共混膜的抗张强度 ,并以抗张强度最大的壳聚糖 明胶共混膜为载体 ,氧氟沙星为模型药物制得具有抗菌性能的氧氟沙星 -壳聚糖 -明胶共混膜。通过红外光谱 (FT -IR) ,X射线衍射 (X ray) ,扫描电子显微镜 (SEM)表征了共混膜的特性。结果表明 :明胶质量分数为 2 5 %时 ,壳聚糖 明胶共混膜的抗张强度最大 ,达 5 5MPa。壳聚糖、明胶、氧氟沙星三者在共混膜中有很好的相容性 ,并且形成了分子间氢键     

明胶/壳聚糖共混膜的制备

本文研究了明胶与壳聚糖共混制膜技术,考察了影响交联反应的因素。结果表明,共混体系中明胶和壳聚糖的比例、体系的pH影响较大,而体系的温度的影响不显著;通过对制备得到的明胶-壳聚糖共混膜进行的X-RD证明,明胶和壳聚糖分子间发生了交联反应。     

明胶/XNBR复合膜的制备及其性能的研究

采用水溶液共混法制备明胶XNBR复合膜。对该膜制备条件的研究表明:在明胶、XNBR质量分数比为10:1,反应温度70℃,反应时间90min的条件下所得膜的力学性能较好。对明胶/XNBR复合膜和明胶/壳聚糖复合膜进行了对比研究,结果表明,明胶/XNBR复合膜较明胶/壳聚糖复合膜有更好的力学性能。     

PVA与壳聚糖共混膜的制备及性能研究

用溶液共混法制备PVA与壳聚糖共混膜,用红外光谱法对共混膜进行了表征,并对膜的吸水率、透光率和力学性能进行测试。结果表明,共混膜中PVA分子链与壳聚糖分子链有一定的相互作用,壳聚糖的引入有利于改善PVA的透光性和降低其吸水率。     

壳聚糖季铵/明胶共混抗菌膜的性能研究

壳聚糖季铵盐是壳聚糖的衍生物,因其具有良好的水溶性、抗菌性、吸湿保湿性以及絮凝性等特点而被应用于诸多领域。本文以明胶和壳聚糖季铵盐膜材料制备了共混抗菌膜,研究了混合体系中壳聚糖季铵盐与明胶配比及壳聚糖季铵盐浓度对共混抗菌膜机械性能、透光性和热稳定性的影响,利用FTIR分析了混合体系中分子间的作用力。结果表明,随着壳聚糖季铵盐含量的增加,共混膜的拉伸强度逐渐降低,断裂伸长率明显增加且共混膜的热稳定性降低。同时,共混膜对大肠杆菌和金黄色葡萄球菌均具有良好的抗菌性。     

交联剂的用量对淀粉-壳聚糖-聚乙烯醇-明胶共混膜的性能影响

本文研究了交联剂对淀粉/壳聚糖/聚乙烯醇/明胶共混膜的透光性、透气性、吸水性及保水性和力学性能的影响。结果表明：共混膜的性能与交联剂有较大关系。在交联剂用量在0%~5%的范围内,随着交联剂用量的增加,共混膜的扯断伸长率、吸水性和保水性随之降低,共混膜的拉伸强度、撕裂强度、透水气性和透光性先增加后减小。     

壳聚糖季鏻盐共混膜的制备及性能研究

用溶液共混法成功地制备了壳聚糖与季鏻盐共混膜,并利用红外光谱、透光率、力学性能、吸水率及抑菌性能测试对其进行了表征。结果表明,共混膜中壳聚糖分子与季鏻盐分子间存在一定相互作用及良好的相容性,季鏻盐含量的增加减小了共混膜的吸水率,增加了其抑菌性能,在季鏻盐含量为20%时,共混膜的综合性能最佳,其中,抗张强度达到60.8 MPa,透光率为85%。     

透明质酸/PVA-SbQ复合膜性能研究

以透明质酸和聚乙烯醇-苯乙烯基吡啶盐缩合物(PVA-SbQ)为原料,结合溶液共混和浇铸法制备了透明质酸/PVA-SbQ复合膜,对膜的性能进行考察研究。结果显示:透明质酸和PVA-SbQ分子链之间能形成氢键,在氢键作用下体系能形成网络结构。在紫外光辐照下,PVA-SbQ发生二聚交联,导致HA/PVA-SbQ形成的网络结构更加密实,水分子更加不易于进入网络结构中,这样吸湿性降低。但是过长时间的紫外照射会打断透明质酸长链,使HA发生一定程度的降解,这样原来的HA/PVA-SbQ网络结构受到一定破坏,吸湿性反而会增加。     

微波交联CTS/GLT共混膜的制备及性能研究

以甲醛为交联剂在微波条件下交联壳聚糖和明胶，成功制备出微波交联CTS／GLT（壳聚糖／明胶）共混膜。研究了膜的力学性能、吸水性和透光率。研究结果表明，最佳制膜条件为微波功率500W，微波辐射时间1．0min，交联剂用量为壳聚糖的0．4％，壳聚糖／明胶质量比为80／20。膜的拉伸强度为56．39MPa，吸水率为1．33％，透光率为92．3％。     

明胶对明胶/壳聚糖共混膜性能影响的研究

采用溶液共混法制备出了一系列明胶／壳聚糖共混膜,并考察了制备条件对膜性能的影响。结果表明：明胶的溶解方式对吸水率和溶胀比影响很小;随明胶分子量增加,共混膜的吸水率和孔洞体积增大;而随共混体系中明胶质量分数的增加,吸水率和孔洞体积亦增加,但溶胀比下降。     

丝素/羧甲基壳聚糖共混膜的结构性能探讨

将含有甘油和戊二醛的丝素与羧甲基壳聚糖按一定比例混合,制得丝素/羧甲基壳聚糖共混膜,对共混膜的结构与性能进行了探讨。结果表明:随着羧甲基壳聚糖含量的增加,共混膜的透气率增大,加入交联剂戊二醛有效地改善了共混膜的力学性能,但其透气率有所降低;当丝素与羧甲基壳聚糖的质量比为4/1时,共混膜的断裂强度最大,力学性能较好,共混膜相容性较好,其断面光滑、致密。制备丝素/羧甲基壳聚糖共混膜的较佳条件为:丝素中的甘油质量分数为15%,戊二醛质量分数为0.075%,丝素与羧甲基壳聚糖质量比为4/1。     

A gelatin/PLA-b-PEG film of excellent gas barrier and mechanical properties

A polylactic acid-polyethylene glycol block copolymer (PLA-b-PEG) was used as an additive to prepare gelatin/PLA-b-PEG blend films for the first time. The PEG molecule block enhanced the compatibility of the PLA molecule block with gelatin, which greatly improved the excellent mechanical and gas barrier properties of the gelatin film. The film contained 5 wt% PLA-b-PEG possessed the highest tensile strength and the highest elastic modulus. When the PLA-b-PEG content further increased to 20 wt%, the tensile strength, elastic modulus and elongation at the break of the blend film were all higher than pure gelatin film, suggesting that the gelatin/PLA-b-PEG blend film was pliable and tough. The blend film possessed not only excellent oxygen barrier property, but also a much-improved water barrier property. The degradation rate of the blend film was elongated controllably by regulating the content of the PLA-b-PEG copolymer. The blend film showed great potential in the application of food packaging.     

Chitosan/Gelatin Blend Membranes for Pervaporation Dehydration of 1,4-Dioxane

Abstract

This paper deals with the development of compatible blend membranes of chitosan (CS) and gelatin (GL) by solution casting and crosslinking with glutaraldehyde. The membranes were tested in pervaporation (PV) dehydration of 1,4-dioxane. Membrane characterizations by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, and a universal testing machine were done to understand their physicochemical properties and for their suitability under PV conditions. The blend membranes were more water selective compared to pristine chitosan membrane at 30°C. Flux increased with increasing wt.% of water of the feed and also by increasing the gelatin content of the blend, but selectivity decreased. Sorption experiments gave information on the interaction between feed mixture and membrane polymers. Membranes of this study could extract nearly 97 wt.% of water from the feed mixture. Arrhenius activation parameters and diffusion coefficients estimated from a temperature dependence of PV results could explain the PV results satisfactorily.     

Physical properties of silk fibroin/chitosan blend films

Silk fibroin/chitosan blend films were examined through IR spectroscopy to determine the conformational changes of silk fibroin. The effects of the fibroin/chitosan blend ratios (chitosan content) on the physical and mechanical properties were investigated to discover the feasibility of using these films as biomedical materials such as artificial skin and wound dressing. The mechanical properties of the blend films containing 10–40% chitosan were found to be excellent. The tensile strength, breaking elongation, and Young's modulus were affected by the chitosan contents of the blend films, which were also related to the density and degree of swelling. The coefficient of water vapor permeability of the blend films increased linearly with the chitosan content, and the values of 1000–2000 g m^?2 day^?1 were comparable to those of commercial wound dressings. Silk fibroin/chitosan blend films had good oxygen and water vapor permeabilities, making them useful as biomaterials. In particular, the blend film containing 40–50% chitosan showed very high oxygen permeability. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 928–934, 2001     

油酸对壳聚糖/玉米醇溶蛋白复合膜液流变及膜性能的影响

为了提高壳聚糖/玉米醇溶蛋白膜的机械性能，将壳聚糖液与玉米醇溶蛋白液共混，向其中加入0%、15%、30%、45%（w/w）的油酸改性，研究膜液的粒径、zeta电位、静态和动态流变特性；然后，分析油酸添加量对膜阻隔性能，机械性能和相容性的影响。结果表明：添加油酸后，膜液体系粒径增大、分散均匀，添加30%油酸的膜液分散性更好，PDI为0.34，粒径为1307.5nm。随着油酸含量增大，膜液粘度减小，流动指数增大，弹性模量和粘性模量增加。OA-30膜机械性能较好，抗拉强度达到36.37MPa，断裂延伸率达到22.32%。膜的阻隔性增强，水蒸气、氧气透过率分别降低了44.21%和66.52%。复合膜中壳聚糖与玉米醇溶蛋白分子相容性好，表面光滑平整。综上所述，油酸改性改善了壳聚糖/玉米醇溶蛋白复合膜性能。     

Preparation and characterization of artificial skin using chitosan and gelatin composites for potential biomedical application

A bioadhesive wound-dressing material based on the combination of gelatin and chitosan with a proper ratio was developed and successfully applied in biomedical fields. The composite films were prepared with increase in chitosan concentration in a fixed amount of gelatin and were evaluated for mechanical stability (e.g., tensile strength, elongation-at-break), water and buffer uptake capacity, water and buffer aging, molecular structure, morphology, thermal stability, and for biological properties (e.g., antimicrobial activity, cytotoxicity, in vivo wound-healing performance). It is noteworthy that the 10:3 (gelatin:chitosan) composite films showed the best physico-mechanical, thermal, and antimicrobial properties among the other ratios blend films. The improved mechanical and thermal stability of the 10:3 composite film suggested its promising use as carrier for controlled release drug. The composite film was evaluated using a rat model for in vivo tests to ascertain the applicability of the proper ratio of the chitosan and gelatin in the film for best wound-healing activity. Wound sites dresses with gelatin/chitosan composite films showed excellent rapid healing of the wound surface than those dressed with eco-plaster and gauze. Within a day after dressing with 10:3 composite film, the healing efficiency was found to be 80?%.     

Separation of alcohol–water mixture by pervaporation through a novel natural polymer blend membrane–chitosan/silk fibroin blend membrane

A novel natural polymer blend membrane, namely chitosan/silk fibroin blend membrane, was prepared. The selective solubility and the pervaporation properties of alcohol–water mixture were studied. The results showed that the membrane was water selective and the separation factor of ethanol–water mixture could be improved compared to pure chitosan membrane, when silk fibroin content in blend membrane was no more than 40 wt %. The blend membrane exhibited a best performance, (i.e., the water in permeate was large than 99 wt % when silk content was 20 wt % and the crosslinking agent–glutaraldehyde content was 0.5 mol %). The mechanism of improvement on pervaporation properties was explained by reducing the free volume and freeing hydrophilic groups of chitosan because of the strong intermolecular hydrogen bond forming between chitosan and silk fibroin in blend membrane. In addition, the influence of operation temperature and feed concentration as well as the pervaporation properties of isopropanol–water mixture were also studied. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 975–980, 1999