羟基磷灰石明胶复合材料的研究进展

主要是介绍羟基磷灰石明胶复合材料的研究进展。分析了羟基磷灰石明胶物理复合方法和化学复合方法。及该系统在其他方面的应用．最后对羟基磷灰石明胶复合材料的发展进行了展望。     

碳纳米管/高聚物复合材料研究进展

介绍了碳纳米管/高聚物复合材料的研究进展,并对碳纳米管/高聚物复合材料研究中的工艺、方法及存在问题进行了论述。     

超声化学法合成羟基磷灰石-明胶复合材料

以Ca（NO3）2,（NH4）2HPO4,明胶和戊二醛为原料,用超声化学法合成了尺寸约为30nm×100nm,平均长径比在2-3,分散性良好的羟基磷灰石-明胶复合材料。对比研究了超声化学法与传统化学沉淀法对复合材料结晶性能和力学性能的影响。结果表明,与传统化学沉淀法相比,超声化学法可以在较短时间内显著提高羟基磷灰石的结晶度、改善结晶状态,使复合材料的抗拉强度和抗压强度分别达到52．4MPa和56．8MPa。     

作为载体材料应用的明胶基复合材料研究进展

明胶由于其独特的性能广泛应用于制药工业,明胶作为载体材料在人体环境中易溶解,因此通常采用交联的方法与其他材料进行复合改性。本文从应用角度人手,对近年来明胶基复合材料的应用进行了综述。     

明胶基缓释复合材料的制备及应用

明胶基复合材料既有良好的生物相容性和可降解性,又兼具机械强度高和多功能性,已成为缓释制剂的理想材料,在生物医学领域展现出广阔的应用前景。该文综述了明胶与其他材料复合制备缓释材料的方法,对近年来明胶基缓释复合材料在医药领域的应用现况进行了简述。最后,归纳了明胶基缓释复合材料面临的挑战和存在的技术问题,并对其未来进行了展望。     

纳米/环氧树脂基复合材料研究进展

对纳米／环氧树脂基复合材料的制备方法以及纳米材料在环氧树脂改性中的应用进行了综述，并对我国纳米材料的研究及生产情况进行了介绍。     

橡胶/纤维复合材料研究进展

综述了以橡胶为基体,纤维为增强材料制备橡胶/纤维复合材料的国内外研究进展。橡胶通过与碳纤维、玻璃纤维、芳纶纤维、菠萝叶纤维以及其它类型的纤维复合可显著改善橡胶的物理、机械和热性能,从而拓宽其应用范围。开发纤维表面改性的绿色环保的低成本制备技术以及新型的功能化纳米微纤材料将是该领域今后发展的主要方向。     

橡胶/纤维复合材料研究进展

综述了以橡胶为基体,纤维为增强材料制备橡胶/纤维复合材料的国内外研究进展。橡胶通过与碳纤维、玻璃纤维、芳纶纤维、菠萝叶纤维以及其它类型的纤维复合可显著改善橡胶的物理、机械和热性能,从而拓宽其应用范围。开发纤维表面改性的绿色环保的低成本制备技术以及新型的功能化纳米微纤材料将是该领域今后发展的主要方向。     

接枝交联明胶的研究（Ⅱ）：具有亲水性与亲油性接枝支链的交联明胶的合成…

首次以ＡＰＳ－Ｎａ２Ｓ２Ｏ３为引发体系，实现了甲基丙烯酸甲酯与Ｇｅｌｘ－ｇ－ＰＭＡＡ的接枝共聚反应，研究了反应规律，以ＩＲ表征了产物的结构；得到两亲性接枝共聚交联明胶，并对此类接枝改性明胶在各种溶剂中的溶胀行为作了初步的研究。     

聚乳酸/羟基磷灰石复合材料研究进展

综述了近年聚乳酸/羟基磷灰石复合材料的制备及改性方法,包括溶液共混法、熔融共混法和原位共聚法等。同时对聚乳酸/羟基磷灰石复合材料在人工骨修复以及生物固定支撑材料等领域的应用前景进行了展望。聚乳酸/羟基磷灰石复合材料的高性能化和降解速率可控将是新一代聚乳酸/羟基磷灰石复合材料的追求目标。     

Preparation and characterization of hydroxyapatite/chitosan–gelatin network composite

A novel composite composed of hydroxyapatite (HA) and a network formed via cocrosslinking of chitosan and gelatin with glutaraldehyde was developed. Two preparation methods are described in detail. A porous material, with similar organic–inorganic constituents to that of natural bone, was made by a unique sol–gel method. The formation of the network in the presence of HA was characterized using IR analysis. The morphology of the composites was also examined using SEM. In addition, XRD was applied to estimate the change in the component crystal. The results indicate that the presence of HA does not retard the formation of the chitosan/gelatin network. On the other hand, the polymer matrix has hardly any influence on the high crystallinity of HA. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2929–2938, 2000     

明胶/阿拉伯胶复合凝聚法制备DCOIT微胶囊

以羟乙基纤维素(HEC)为乳化剂、明胶和阿拉伯胶为壁材、4,5-二氯-2-正辛基-4-异噻唑啉-3-酮(DCOIT)芯材、甲醛为固化剂、冰醋酸(HAc)和氢氧化钠(NaOH)为pH值调节剂,采用复合凝聚法制备了DCOIT微胶囊。通过单因素试验法探讨了壁材浓度、壁芯比、反应时间、pH值、搅拌速率和乳化剂类型等对微胶囊的粒径、稳定性和包埋率等影响。结果表明:当w(壁材)=3%、壁芯比=m(壳层单体)/m(核层单体)=3、反应时间为2 h、pH≤4.5和搅拌速率为1 000 r/min时,相应DCOIT微胶囊的性能相对最佳。     

明胶基天然高分子/氧化石墨烯复合微胶囊的制备及调湿性能

利用调湿材料的吸放湿性能调节湿度是一种环保节能的被动调湿技术,广泛应用于室内调湿、食品包装、文物保护等领域。采用壳聚糖、液体石蜡、氧化石墨烯(GO)为微胶囊核心材料,利用壳聚糖和GO的静电作用形成类似表面活性剂亲水亲油结构的壳聚糖-GO结合体,在乳化剂和壳聚糖-GO结合体共同作用下乳化获得乳胶束,然后以此乳胶束为模板,采用戊二醛交联法制备了明胶基天然高分子/GO复合微胶囊(M-GO)。考察了GO用量、乳化pH值对乳液胶束粒径和稳定性的影响。在最佳乳化条件下制备了微胶囊,并研究了GO的引入对微胶囊的结构和吸/放湿性能的影响。通过傅立叶红外光谱(FT-IR)、扫描电镜(SEM)、透射电镜(TEM)、氮气吸附对微胶囊的结构进行表征,通过测试微胶囊吸湿率和放湿率研究其调湿性能。结果表明,当GO用量为3 mL (1 mg/mL)、乳化pH值为5.10时,乳化形成的乳液粒径均匀且乳液的稳定性较好。GO与壳聚糖、明胶相互作用成功制备了微胶囊,未引入GO的微胶囊呈封闭的微球结构,当引入GO后所得的微胶囊M-GO为壳层开孔的中空结构,具有较大的比表面积和孔体积,有利于对水分的吸附。M-GO在不同湿度下的饱和吸湿量、吸湿/放湿率均优于未引入GO微胶囊,说明GO通过改变微胶囊的微结构、增加吸附水分的表面积,从而能够提高调湿性能。     

Controlling absorbency in gelatin networks: Preparation and characterization of alkylated,crosslinked gelatin

Gelatin is a highly abundant and relatively inexpensive protein which is used in a variety of gel applications including photography, drug delivery, microencapsulation, and food preparation. Control of network formation in gelatin may therefore provide methods of preparing protein gels tailored for specific applications. In this study, circular dichroism (CD), Raman, and nuclear magnetic resonance (NMR) spectroscopies were used to characterize ordering processes which occur in gelatin and their relationship to absorbency. Ordering of the unmodified protein, studied as a function of concentration, temperature, and time after initial preparation, correlates inversely with absorbency. Chemical modification was used to control the absorbency and solubility of the protein gels. Alkylation of gelatin using glycidyltrimethylammonium chloride causes substantial increases in water absorbency with degrees of substitution as low as 0.5%. Increases in saline swelling were observed only after additional modification of the alkylated gelatin with a nonionic polyoxyalkyleneamine crosslinking agent (Jeffamine®). Limiting the initial degree of substitution prior to crosslinking (to just below 1%) plays a key role in optimizing the absorbency and minimizing the dissolution of the gel in saline. The methods and principles used to manipulate the absorbency of gelatin may also find use for other natural protein systems. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68:281–292, 1998     

Enhanced compatibilization and orientation of polyvinyl alcohol/gelatin composite fibers using carbon nanotubes

Polyvinyl alcohol (PVA)/gelatin composite fibers containing carbon nanotubes (CNTs) had been prepared by wet‐spinning method. A remarkable increase of tensile strength of the PVA/gelatin fibers was achieved by adding small amount of CNT. The mechanism of reinforcement has been studied using a combination of differential scanning calorimetry (DSC), 2D wide‐angle X‐ray diffraction (2D‐WAXD) and scanning electron microscopy (SEM). SEM showed a decreased gelatin domain size by adding CNTs, suggesting a possible compatibilization effect between PVA and gelatin. On the other hand, an increased crystallinity and degree of orientation of PVA/gelatin fibers has been observed by adding CNTs. Thus, the increased compatibilization, crystallinity and degree of orientation in PVA/gelatin/CNTs composite fibers should be the reasons for the observed increase of mechanical properties. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

植酸改性的明胶复合膜制备及其结构与性能分析

采用溶液共混法,通过添加不同比例的植酸探索制备植酸/明胶复合膜,测试不同植酸含量对复合膜的结晶结构、微观形貌、透明度、溶胀性和机械强度的影响,进而分析探究植酸对明胶膜的结构调控和性能改善作用。结果表明,与纯明胶膜相比,植酸对明胶有明显的交联改性作用,复合膜具有致密均一的内部结构,植酸通过极性基团的相互作用抑制了明胶的自结晶行为,使复合膜结晶度降低。随着植酸含量的增加,复合膜的可见光透过率下降,溶胀率变化表明植酸与明胶的结构重组能有效阻隔水分子的渗透。复合膜力学强度随着植酸的加入呈上升趋势,当植酸质量分数达10%时,植酸/明胶复合膜拉伸强度约为61.57MPa,较纯明胶的拉伸强度（50MPa）提高了约20%,但对断裂伸长率无明显作用。     

pH-sensitive chitosan/gelatin hybrid polymer network microspheres for delivery of cimetidine

pH responsive chitosan/gelatin hybrid polymer network (HPN) microspheres were prepared via the inverse emulsion crosslinking method. Cimetidine release from the microspheres was studied. The drug only delivers in acidic medium, while the release rate can be controlled by the HPN composition and the degree of deacetylation.     

Electrospun gelatin/nylon‐6 composite nanofibers for biomedical applications

We describe the preparation and characterization of gelatin‐containing nylon‐6 electrospun fibers and their potential use as a bioactive scaffold for tissue engineering. The physicochemical properties of gelatin/nylon‐6 composite nanofibers were analyzed using field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, TGA and contact angle and tensile measurements. FE‐SEM and TEM images revealed that the nanofibers were well oriented and showed a good incorporation of gelatin. FTIR spectroscopy and TGA also revealed that there was good interaction between the two polymers at the molecular level. The adhesion, viability and proliferation properties of osteoblast cells on the gelatin/nylon‐6 composite nanofibers were analyzed by an in vitro cell compatibility test. Our results suggest that the incorporation of gelatin can increase the cell compatibility of nylon‐6 and therefore the composite mat obtained has great potential in hard tissue engineering. © 2012 Society of Chemical Industry     

The structure and properties of solid gelatin and the principles of their modification

The structure and properties of gelatin in the solid state are discussed with respect to the structural, chemical and polymeric characterization of gelatin. Also the influence of casting conditions on the structural characteristics of gelatin, the relationship between the physico-mechanical properties of gelatin and the conformational state of the gelatin macromolecules and the effect of water on the structural and mechanical properties of gelatin are discussed. The effect of heat on the structural transformations and properties of gelatin are considered with reference to structural transformations, physico-mechanical properties, physico-chemical properties, internal stress and relaxation properties. The principles of modification of the physico-mechanical properties of gelatin are discussed, in particular the physical modification, physico-chemical modification and finally chemical modification.     

明胶及其酰化产物的沉降性能

本文研究了明胶和酰化明胶溶液的沉降性能,考察了试剂用量及pH值对沉降性能的影响,找出了一些基本的规律,发现了氯化钠盐析与乙醇、丙酮溶剂沉降时,明胶和酰化明胶沉降效率的不同,并从理论上进行了初步的探讨。