葡甘聚糖-壳聚糖-聚乙烯醇共混膜的结构表征及性能研究

用溶液共混法制备了葡甘聚糖-壳聚糖-聚乙烯醇共混膜,并用红外光谱(FTIR)、X-射线衍射(XRD)、扫描电镜(SEM)及透光率表征了膜的结构,同时测定了共混膜的力学性能、吸水率、水蒸气透过率。结果表明:共混膜中葡甘聚糖、壳聚糖及聚乙烯醇之间存在着强烈的相互作用和良好的相容性,三者共混明显改善了纯聚合物和二元膜的性能。     

交联羧甲基魔芋葡甘聚糖的合成及阻垢性能研究

将天然产物魔芋粉进行改性,制备了交联羧甲基魔芋葡甘聚糖,通过静态阻垢法对交联羧甲基魔芋葡甘聚糖的阻碳酸钙垢性能进行了评价.结果表明,当温度为70℃、pH≤7.(p)(Ca2+)≤500 mg/L时,交联羧甲基魔芋葡甘聚糖具有良好的阻垢效果.推测其阻垢作用机理主要是晶格畸变作用和螯合增溶作用.     

苯甲酸钠对共混膜的影响及研究

壳聚糖(CS)、魔芋葡甘聚糖(KGM)与苯甲酸钠(SB)通过溶液共混法制备三元共混膜。采用红外光谱、X射线衍射仪表征了共混膜的结构,紫外光谱测试其透光率,拉伸试验机测试其力学性能,同时测试了该膜的吸水率及抗菌性能。结果表明,壳聚糖与魔芋葡甘聚糖摩尔比为3∶1,苯甲酸钠占两种单体质量6%时,制得的共混膜断裂伸长率达到最大值,且膜的抗菌性最好,同时苯环引入能够降低膜的吸水性。     

苯甲酸钠对共混膜的影响及研究

壳聚糖(CS)、魔芋葡甘聚糖(KGM)与苯甲酸钠(SB)通过溶液共混法制备三元共混膜。采用红外光谱、X射线衍射仪表征了共混膜的结构,紫外光谱测试其透光率,拉伸试验机测试其力学性能,同时测试了该膜的吸水率及抗菌性能。结果表明,壳聚糖与魔芋葡甘聚糖摩尔比为3∶1,苯甲酸钠占两种单体质量6%时,制得的共混膜断裂伸长率达到最大值,且膜的抗菌性最好,同时苯环引入能够降低膜的吸水性。     

羧甲基葡甘聚糖-壳聚糖复合膜对小鼠成纤维细胞的相容性研究

利用溶液共混法制备了羧甲基葡甘聚糖-壳聚糖复合膜.以体外培养的小鼠成纤维细胞作为对象,通过复合膜浸渍液培养和膜材料直接培养法以及膜材料的溶血实验,评价材料的细胞相容性.采用MTT法检测膜材料浸渍液中细胞的增殖情况,光镜下观察膜材料浸渍液中细胞的生长和培养7天的NIH3T3-多孔膜复合物的组织切片,同时结合扫描电镜观察培养7天的NIH3T3-膜材料复合物表面的细胞生长状况.结果发现：复合膜浸渍液对细胞无毒性效应,NIH3T3细胞在复合膜上能很好地贴附,生长旺盛.比较了致密常规膜和多孔膜上细胞的生长状态,多孔膜上细胞能向材料内部迁移,呈立体生长.复合膜溶血率测定值＜5%.所以羧甲基葡甘聚糖-壳聚糖复合膜有良好的细胞相容性.     

海藻酸/羧甲基纤维素共混膜的结构与性能研究

用溶液共混法制备了海藻酸/羧甲基纤维素共混膜,通过红外光谱、X-射线衍射、原子吸收光谱、扫描电镜、热分析等对共混膜的结构进行了表征,并测定了不同配比共混膜的透光率、拉伸强度、断裂伸长率、水蒸汽透过率和吸水率.结果表明:共混膜中海藻酸和羧甲基纤维素之间具有较强的相互作用和良好的相容性.共混膜具有良好的力学性能,在生物材料...     

羧甲基壳聚糖/氧化魔芋葡甘聚糖复合海绵的制备与性能评价

以羧甲基壳聚糖(CMCS)和氧化魔芋葡甘聚糖(OKGM)为原料,采用冷冻干燥法制备羧甲基壳聚糖/氧化魔芋葡甘聚糖(CMCS/OKGM)复合海绵,通过FTIR、~1HNMR、SEM等对其结构进行表征,通过吸水率、孔隙率、透气率、对NIH-3T3细胞增殖的影响、抗菌能力及急性全身毒性等测试来评价其性能。确定CMCS/OKGM复合海绵的最优制备工艺为:先采用高碘酸钠氧化制备OKGM,再按5∶5的体积比将质量浓度均为5%的CMCS溶液和OKGM溶液混合,加入2%的甘油作为塑化剂,冷冻干燥即得。CMCS/OKGM复合海绵具有良好的吸水率、孔隙率、透气率、抗菌活性、生物安全性且能促进表皮细胞增殖,是优良的医用慢性伤口敷料基础底料。     

热塑性魔芋葡甘聚糖/聚己内酯共混物制备及表征

以资源丰富的天然可降解高分子材料魔芋葡甘聚糖(KGM)为原料, 以甲基丙烯酸甲酯和丙烯酸甲酯为单体,过硫酸铵为引发剂,合成了热塑性魔芋葡甘聚糖。将热塑性魔芋葡甘聚糖(TDKGM)和聚己内酯(PCL)熔融共混制备热塑性魔芋葡甘聚糖/聚己内酯共混物(TDKGM/PCL)。通过热重分析、扫描电镜、差示扫描量热仪(DSC)、XRD和万能力学试验机等对TDKGM/PCL共混物的结构和性能进行了分析表征。结果表明：共混物中热塑性魔芋葡甘聚糖对聚己内酯的结晶起到了成核剂的作用,使聚己内酯能在较高温度下开始结晶,并可明显提高共混物中聚己内酯相的结晶速度。TDKGM/PCL复合材料(20/80)的最大扭矩值为48.7 N·m,塑化时间在300 s以上,平衡扭矩在10.7 N·m,与PE相当接近,并且具有高达256.48%的断裂伸长率。     

天然高分子魔芋葡甘聚糖的复配产物成膜研究

魔芋葡甘聚糖是日用化学工业潜在的廉价原料之一。以魔芋葡甘聚糖为原料,分别加入卡拉胶、卡拉胶和黄原胶、黄原胶等其它高分子多糖后进行复配。利用红外光谱法地葡甘聚糖及复配产物的成膜机理进行了探讨,并对膜的性能进行了分析研究,提出了制膜方法。文中成膜速度控制容易,制作方法简便锭为开发多种具有凝胶成膜性的日用化学产品提供了依据。     

胶原蛋白/海藻酸/羧甲基纤维素共混膜的结构与性能

利用溶液共混法成功制备了新型生物膜材料—胶原蛋白/海藻酸/羧甲基纤维素共混膜(blend film),通过红外光谱、X-射线衍射、原子吸收光谱、扫描电镜对共混膜的结构进行了表征,同时测定了不同配比共混膜的透光率、拉伸强度(tensile strength)、断裂伸长率(breaking elonga-tion)、吸水率和水蒸汽透过率;对共混膜进行了热重和差示量热扫描分析。结果表明:共混膜中胶原蛋白、海藻酸钠和羧甲基纤维素之间具有较强的相互作用和良好的相容性,Ca2+交联、氢键以及静电引力等强烈相互作用使三元共混膜力学性能等得到了显著改善,其拉伸强度明显高于胶原蛋白膜、海藻酸膜和胶原蛋白/海藻酸二元共混膜、海藻酸钠/羧甲基纤维素二元共混膜,胶原蛋白质量分数为18.1%、海藻酸质量分数为45.5%和羧甲基纤维素为36.4%的三元共混膜中抗张强度最大,达102MPa。三元共混膜具有良好的力学性能,较好的热稳定性,作为一种新型生物材料可望在生物医学和食品材料领域得到应用。     

Blend films from konjac glucomannan and sodium alginate solutions and their preservative effect

In order to enhance the mechanical properties of konjac glucomannan film in the dry state and research the application of konjac glucomannan on food preservation domain, blend transparent film was prepared by blending 3 wt % sodium alginate aqueous solution with 4.5 wt % konjac glucomannan aqueous solution and dried at 40^oC for 4 h. The structure and properties of the blend films were studied by infrared, wide angle X‐ray diffraction, scanning electron microscopy, and differential thermal analysis. Crystallinities of blend films were increased with the increase of sodium alginate. The tensile strength and breaking elongation of the blend films in dry state were obviously higher than those of both sodium alginate and konjac glucomannan films. Tensile strength of the dry blend film achieved 77.8 MP_a when the retention of sodium alginate in the film was 27.9 wt %. The structure analysis indicated that there was a strong interaction between konjac glucomannan and sodium alginate, and this is resulted from the intermolecular hydrogen bonds. Moisture content and degree of water swelling of the blend films were increased due to the introduction of sodium alginate. Results from the film coating preservation experiment to litchi and honey peach showed that this blend film had water‐holding ability. The fruit weight loss rate and rot rate both decreased by various values. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 617–626, 2000     

Improvement of physical properties of crosslinked alginate and carboxymethyl konjac glucomannan blend films

Blend films from carboxymethyl konjac glucomannan and sodium alginate in different ratios were prepared by blending 4 wt % sodium alginate aqueous solution with 2 wt % konjac glucomannan aqueous solution. After crosslinking with 5 wt % calcium chloride aqueous solution, the blend films formed a structure of semi‐interpenetrating networks. The structure and physical properties of both uncrosslinked and crosslinked films were characterized by Fourier transformed infrared spectra (FTIR), differential thermal analysis (DTA), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and tensile tests. The results indicated that the mechanical properties and the thermal stability of the films were improved by blending sodium alginate with carboxymethyl konjac glucomannan due to the intermolecular hydrogen bonds between sodium alginate and carboxymethyl konjac glucomannan. The crosslinked blend films with Ca²⁺, compared with uncrosslinked blend films, exhibited further improved physical properties due to the formation of a semi‐IPN structure. Furthermore, the degree of swelling of the crosslinked films was also investigated. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2554–2560, 2002     

Blend films from chitosan and konjac glucomannan solutions

Blend films were prepared by blending 7 wt % konjac glucomannan (KGM) aqueous solution with 2 wt % chitosan (CH) in acetate solution and dried at 40°C for 4 h to obtain the transparent films. Their structure and properties were studied by infrared (IR), wide‐angle X‐ray diffraction (WAXD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential thermal analysis (DTA). Crystallinities of the blend films decreased with the increase of konjac glucomannan. The thermostability, tensile strength, and breaking elongation of the blend films in dry state were obviously higher than those of both konjac glucomannan and chitosan films. Tensile strength of the dry blend film achieved 73.0MPa when the weight ratio of chitosan to konjac glucomannan was 7:3. The structure analysis indicated that there is a strong interaction between konjac glucomannan and chitosan resulted from intermolecular hydrogen bonds. The water solubility of the blend films was improved by blending with konjac glucomannan, so they have promising applications to soluble antiseptic coating of pills. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 509–515, 2000     

Preparation and characterization of konjac glucomannan and sodium carboxymethylcellulose blend films

The novel blend films of konjac glucomannan (KGM) and sodium carboxymethylcellulose (NaCMC) were prepared by casting the mixed polymer aqueous solutions. The physical properties of the blend films from konjac glucomannan and sodium carboxymethylcellulose were investigated by using FT‐infrared (FTIR), wide‐angle X‐ray diffraction (WAXD), differential thermal analysis (DTA), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and measurements of mechanical properties. The experimental results showed that the occurrence of the interactions between KGM and NaCMC molecular chains through hydrogen bond formation, and the physical properties of the films largely depend on the blending ratio. The thermal stability, mechanical properties of both tensile strength, and elongation at break of the blend films were improved by blending KGM with NaCMC. The surface morphology of the films observed by SEM was consistent with the results mentioned above. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 26–31, 2001     

Structure and properties of collagen‐konjac glucomannan‐sodium alginate blend films

A new kind of blend film was made by mixing the solutions of collagen, konjac glucommnnan (KGM), and sodium alginate. The structure of the blend film was characterized by FTIR, XRD, atomic absorption spectrophotometer, and SEM, respectively. The effects of weight ratio between the polymers on light transmittance, tensile strength, elongation at break, water permeability, and water absorption of the film were studied. The results showed that there were strong interactions and good compatibility between collagen, KGM, and sodium alginate in the film. The film possesses good mechanical properties. Therefore, it can be applied in biomedicine as a new type of biomaterial. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Characterization of konjac glucomannan–gelatin blend films

Novel blend films of konjac glucomannan (KGM) with gelatin were prepared by using the solvent‐casting technique. Transparent blend films were obtained in all blending ratios of the two polymers. The structure and physical properties of the films were investigated by Fourier transform IR, wide angle X‐ray diffraction, thermogravimetric analysis, differential thermal analysis, scanning electron microscopy (SEM), and strength tests. The results indicated that intermolecular interactions between the KGM and gelatin occurred that were caused by hydrogen bonding and the physical properties of the films largely depended on the blending ratio. The crystallinities of the blend films decreased with the increase of the KGM. The thermal stability and mechanical properties (tensile strength and elongation at break) of the films were improved by blending KGM with gelatin. It is worth noting that the blend films had a good tensile strength of 38 MPa when the KGM content in the blend films was around 30 wt %. The surface morphology of the blend films observed by SEM displayed a certain level of miscibility. Furthermore, the water absorbability of the blend films was also measured and discussed. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1596–1602, 2001     

Preparation and physical properties of konjac glucomannan–polyacrylamide blend films

The blend films of konjac glucomannan (KGM) and polyacrylamide (PAAm) were prepared by using the solvent‐casting technique. Transparent blend films were obtained in all blending ratios. The physical properties of the films were investigated by Fourier transform infrared spectroscopy, wide‐angle X‐ray diffraction, thermogravimetric analysis, scanning electron microscopy, and by measurement of mechanical properties. The results indicated the occurrence of intra‐ and intermolecular interactions of the pure components, as well as the intermolecular interactions between KGM and PAAm through hydrogen bond formation. The thermal stability and mechanical properties of both tensile strength and elongation at break of the films were improved by blending KGM with PAAm. It was worth noting that the blend film had the greatest tensile strength when the KGM content in the blend films was around 30 wt %. Surface morphology of the films observed by SEM was consistent with the above‐noted results. Furthermore, the water absorbability of the blend films was also investigated. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 882–888, 2001