聚乙烯醇／纳米羟基磷灰石复合水凝胶的制备及抗菌性能

采用溶液法制备了聚乙烯醇/纳米羟基磷灰石复合水凝胶,探讨了聚乙烯醇含量对复合水凝胶抗菌性能的影响,用X射线衍射分析(XRD)、红外光谱分析(FT-IR)、扫描电镜(SEM)等方法对聚乙烯醇/纳米羟基磷灰石复合水凝胶的晶态结构及分散状态进行了表征,并用抑菌圈法对复合水凝胶的抗菌性能进行检测.研究发现,聚乙烯醇/羟基磷灰石复合水凝胶形成了良好的结品结构且分散良好,分布均匀,其对金黄色葡萄球菌、枯草杆菌、白色念珠菌具有良好的杀灭作用,其抑菌圈直径分别达15 mm、20 mm、20 mm,但对大肠杆菌无抵制作用.     

基于互穿网络技术构筑的氧化海藻酸钠/纤维素纳米晶/聚丙烯酰胺-明胶复合水凝胶与性能

为了提高海藻酸盐水凝胶的生物应用性,采用互穿网络技术、纤维素纳米晶(CNCs)补强和明胶表面覆积相结合的方法构建了氧化海藻酸盐/纤维素纳米晶/聚丙烯酰胺-明胶 (OSA/CNCs/PAM-GT) 复合水凝胶。通过FT-IR、TGA、 XRD、溶胀性和降解性实验以及细胞相容性测试考察了CNCs含量对OSA/CNCs/PAM-GT复合水凝胶结构和性能的影响。实验结果表明,CNCs能够与基体中的聚合物产生相互作用力。并且随着CNCs含量的增加,OSA/CNCs/PAM-GT 复合水凝胶的孔隙率下降,力学性能提高。而且它们的溶胀性和生物降解性虽然受CNCs含量增加而呈现下降的趋势,但是幅度较小,说明CNCs能够在一定程度上调控复合水凝胶的物化性能。同时,OSA/CNCs/PAM-GT 复合水凝胶展现出较好的细胞粘附、增殖和分化性能。当CNCs的含量在0.5%时,细胞增殖的效果最佳,而CNCs的含量为1.5%时,细胞分化效果最显著。因此,将CNCs掺杂到OSA/PAM互穿网络基体中能够有效地调控其生物性能,使其适用于生物医学领域。     

化学交联法制备ZnO/PVA复合水凝胶

以氯化锌为原料制备纳米氧化锌(ZnO),采用化学交联法法制备ZnO/聚乙烯醇(PVA)复合水凝胶,研究ZnO加入量对复合水凝胶拉伸强度、断裂伸长率以及溶胀性能的影响。实验结果表明:ZnO含量为0.1%时,复合水凝胶的拉伸强度和断裂伸长率最大,而ZnO含量为0.4%时,复合水凝胶的溶胀率最大。     

3D打印纳米纤维/藻酸盐基水凝胶的制备与表征

以2,2,6,6-四甲基哌啶氧化物(TEMPO)氧化细菌纤维素(TOBC)作为增强体,制备了一系列的纳米纤维/藻酸盐(SA)基纳米复合水凝胶,研究了TOBC对纳米复合水凝胶的微观形貌、压缩、溶胀、生物相容性等性能的影响。通过流变实验与3D打印实验探究TOBC/SA纳米复合水凝胶的可印刷能力。结果表明,TOBC的加入显著增强了SA水凝胶的压缩性能。当TOBC含量为50%时,水凝胶压缩强度可达260.9 kPa,压缩性能最优。TOBC增强了混合油墨的非牛顿性,并使触变恢复能力最高达到83%,可3D打印制造出结构可控的复杂结构。纳米复合水凝胶表现出优异的细胞相容性,在生物医用领域特别是组织再生具有潜在的应用前景。     

纳米硅/聚丙烯酰胺水凝胶的制备及性能研究

通过光催化方法制备了纳米硅(F-SiNPs),再以丙烯酰胺(AM)为单体、过硫酸铵为引发剂、N,N-亚甲基双丙烯酰胺为交联剂,采用原位聚合法在纳米硅水溶液中制备了F-SiNPs/聚丙烯酰胺(F-SiNPs/PAM)复合水凝胶,并采用激光粒度分析仪(DLS)、场发射透射电子显微镜(FE-TEM)、红外光谱(FT-IR)、X射线光电子能谱(XPS)、场发射扫描电子显微镜(SEM)、紫外荧光光谱(UV-PL)等手段对复合水凝胶的结构与性能进行表征。结果表明,成功地制备了F-SiNPs/PAM复合水凝胶,且F-SiNPs/PAM复合水凝胶同时具有荧光特性与pH敏感性。     

纳米银对复合水凝胶性质影响的研究

超声波作用于含有单体AMPS、MMA和交联剂MBA的Ag NO3水溶液,使Ag+还原为纳米级的银粒子,与此同时单体和交联剂形成共聚物,从而在无引发剂和还原剂的条件下制备出纳米银/P(AMPS-MMA)复合水凝胶。TEM表明,制备的纳米银粒径在10~20nm,粒径分布较窄,且均匀地分散在水凝胶聚合物里;通过研究纳米银/P(AMPS-MMA)复合水凝胶和P(AMPS-MMA)水凝胶的溶胀率、溶胀动力学、退溶胀动力学和温敏性质等表明,纳米银增强了复合水凝胶的吸水性能和提高了复合水凝胶的温敏性。     

温敏多孔纳米复合水凝胶的制备及性能研究

试验以钠基膨润土,丙烯酰胺和双丙酮丙烯酰胺为主要原料,以聚乙二醇为致孔剂,N,N-亚甲基双丙烯酰胺为交联剂,采用插层聚合法和接枝共聚致孔法制备了温敏多孔纳米复合水凝胶。研究了复合水凝胶的失水率性能和对污染水体中Cr(Ⅵ)的去除效果。结果表明,制备的纳米复合水凝胶具备温度响应性,随着温度的升高,水凝胶的失水率可达43. 03%。复合水凝胶随着投加量的增加,对Cr(Ⅵ)去除率越高。水凝胶投加量为5. 5 g时,最好吸附量可达81. 3%。     

PAM/SA/CNFs复合水凝胶的制备与性能研究

通过溶液交联聚合法制备了聚丙烯酰胺(PAM)/海藻酸钠(SA)/纤维素纳米纤维(CNFs)半互穿网络结构复合水凝胶。研究了不同添加量的CNFs对SA/PAM/CNFs复合水凝胶的溶胀性能和力学性能的影响;并测定了该复合水凝胶对亚甲基蓝染料的吸附性能。结果表明:当CNFs添加量为0.1ω/%时,复合水凝胶对亚甲基蓝染料的吸附效果最好,且平衡溶胀度最大为9.47,复合水凝胶压缩应力达到114.64 kPa。     

聚丙烯酰胺/碳量子点/氧化石墨烯复合水凝胶制备及其性能分析

目前相比于只用一种物理交联剂,同时用两种物理交联剂提高复合水凝胶力学性能的研究少有报道。为了研究同时以碳量子点（CQDs）和氧化石墨烯（GO）作为多官能度物理交联剂对复合水凝胶力学性能的影响,本文首先分别用低温水热法和改进的Hummer法制备了50mg/mL 的CQDs水分散液和5mg/mL的GO水分散液。通过原位自由基聚合的方法,改变CQDs和GO用量,制备了一系列聚丙烯酰胺（PAM）类纳米复合水凝胶（PAM/CQDs/GO）。利用X射线衍射仪、拉力机和流变仪对所得的水凝胶进行表征和测试。得出当用1mL的CQDs水分散液和4mL的GO水分散液制备的PAM/CQDs/GO复合水凝胶力学综合性能最好,其断裂伸长率为3916.86%,拉伸强度为165.3kPa,杨氏模量为33.36kPa。结果表明：适量的CQDs和GO都能提高PAM/CQDs/GO复合水凝胶的多种力学性能,其中GO更有利于增大纳米复合水凝胶的拉伸强度、杨氏模量和耗散能,而CQDs更有利于增大断裂伸长率。与GO相反,CQDs的加入能提高纳米复合水凝胶的黏性、降低其刚性和再次被拉伸时的杨氏模量。通过对CQDs和GO的用量进行调节,可以制备出力学性能不同的纳米复合水凝胶,以满足不同领域的需要,拓宽水凝胶的应用范围。     

纳米铜碳/海藻酸钠复合水凝胶的制备及性能

以吸附了硫酸铜的天然棉纤维为原料,高温热解制备纳米铜碳复合材料(NCCC),并利用原位释放法以二价钙离子为交联剂制备出纳米铜碳复合材料/海藻酸钠(NCCC/SA)复合水凝胶,来缓释抑藻材料NCCC。调节CaCO₃/SA的质量比,考察海藻酸钠水凝胶的力学性能、溶胀和降解性能来优选凝胶载体。调节NCCC/SA质量比,考察NCCC/SA复合水凝胶力学性能、溶胀和降解性能。NCCC/SA质量比越大,复合水凝胶的力学性能越差,但其溶胀和降解性能几乎没有影响。为了应对动态水环境的使用要求,最终选用CaCO₃/SA的质量比为18.18%的海藻酸钠水凝胶为载体,NCCC/SA质量比为2∶1来制备复合水凝胶,并模拟NCCC的缓释,为NCCC应用于抑藻的研究奠定了理论基础。     

基于海藻酸钠抗菌材料制备及应用的研究进展

概述了静电纺丝技术的原理及其在生物性纳米复合材料制备过程中的作用.该技术可将多种材料以不同的方式复合到同一根纤维中,使得纤维又增添了多种新的功能,因此其在多功能复合材料制备方面的应用广受关注.同时由于海藻酸钠纳米材料具有良好的理化性质、功能特性、生物相容性及特殊的纳米效应,利用静电纺丝技术将高效抗菌剂均匀分布到海藻酸钠材料中制备成抗菌复合薄膜,使其在食品包装、创伤敷料、药物载体及组织工程支架等方面体现出了重要的应用价值.此外,本文还在该技术的基础上,提出了关于静电纺丝制备海藻酸钠抗菌复合薄膜过程中改性剂的优化、抗菌剂的选择等方面的问题,并展望了基于静电纺丝技术的海藻酸钠抗菌复合薄膜的应用前景.     

Construction and evaluation of the hydroxypropyl methyl cellulose-sodium alginate composite hydrogel system for sustained drug release

We prepared a hydroxypropyl methyl cellulose-sodium alginate (HPMC-SA) composite hydrogel with a membrane covering the semi-interpenetrating network based on a semi-synthetic polymer hydroxypropyl methyl cellulose (HPMC) and a natural polymer sodium alginate (SA) by Ca²⁺ crosslinking and polyelectrolyte complexation with chitosan (CS) covering the hydrogel surface. The physiochemical properties of HPMC-SA hydrogels were evaluated by scanning electron microscopy, infrared spectrum, X-ray diffraction, and thermogravimetric analysis. The swelling ratio of the HPMC-SA composite hydrogel in simulated gastrointestinal fluid was measured. The drug release behavior of the HPMC-SA composite hydrogel for macro-molecular and small-molecule drugs was evaluated by using bovine serum albumin, metformin hydrochloride, and indomethacin as model drugs. The results showed that the HPMC-SA hydrogel had good water absorption and degradability, an increased swelling ratio of 55, and a prolonged time for maximum swelling degree of 50 h. Moreover, the hydrogel exhibited higher drug-loading capacity and improvements in the sustained release of bio-macromolecules, demonstrating its potential as a drug carrier for biomedical applications.     

Development of Biocompatible and Antibacterial Collagen Hydrogels via Dialdehyde Polysaccharide Modification and Tetracycline Hydrochloride Loading

Nowadays, collagen hydrogels with both good physicochemical and antibacterial properties for tissue engineering have drawn broad attention. Herein, a biocompatible and antibacterial collagen hydrogel is developed via alginate dialdehyde (ADA) modification and tetracycline hydrochloride (TC) loading based on Schiff's base formation. Fourier transform infrared spectroscopy and X‐ray diffraction spectra suggest the maintenance of collagen structure integrity after ADA modification. The modification significantly contributes to the improved swelling property, resistance against type I collagenase, and strengthens storage modulus of hydrogels with an increase of ADA concentrations. Meanwhile, dynamic release curves of tetracycline hydrochloride (TC)‐loaded hydrogels describe the burst release at the first 15 min then a gradual release, hydrogels act ideally as carriers in antibacterial activity. Furthermore, in vitro biocompatibility and antibacterial properties are successfully confirmed from the fabricated collagen hydrogels. This physicochemical‐ and antibacterial‐property–improved collagen hydrogel would be a potential candidate for wound healing as a scaffold.     

Photosensitive antibacterial and cytotoxicity performances of a TiO2/carboxymethyl chitosan/poly(vinyl alcohol) nanocomposite hydrogel by in situ radiation construction

Nano‐TiO₂/carboxymethyl chitosan (CMCS)/poly(vinyl alcohol) (PVA) ternary nanocomposite hydrogels were prepared by freezing–thawing cycles and electron‐beam radiation with PVA, CMCS, and nano‐TiO₂ as raw materials. The presence of nano‐TiO₂ nanoparticles in the composite hydrogels was confirmed by thermogravimetry, Fourier transform infrared spectroscopy, and X‐ray powder diffraction. Field emission scanning electron microscopy images also illustrated that the TiO₂/CMCS/PVA hydrogel exhibited a porous and relatively regular three‐dimensional network structure; at the same time, there was the presence of embedded nano‐TiO₂ throughout the hydrogel matrix. In addition, the nano‐TiO₂/CMCS/PVA composite hydrogels displayed significant antibacterial activity with Escherichia coli and Staphylococcus aureus as bacterial models. The antibacterial activity was demonstrated by the antibacterial circle method, plate count method, and cell density method. Also, with the Alamar Blue assay, the cytotoxicity of the composite hydrogel materials to L929 cells was studied. The results suggest that these materials had no obvious cytotoxicity. Thus, we may have developed a novel, good biocompatibility hydrogel with inherent photosensitive antibacterial activity with great potential for applications in the fields of cosmetics, medical dressings, and environmental protection. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44150.     

辐射交联PVA/PVP/胶原复合水凝胶的制备及性能研究

采用辐射交联与冻融循环相结合的方法,将胶原引入聚乙烯醇(PVA)/聚乙烯基吡咯烷酮(PVP)水凝胶体系,制备具有较高生物活性的PVA/PVP/胶原复合水凝胶。通过含水率、溶胀性能、力学性能及微观结构研究胶原对复合水凝胶结构与性能的影响,并优选最佳体系进行体外细胞毒性实验(MTT法)。研究结果表明,复合水凝胶具有均匀分布的三维多孔结构,胶原的添加增大水凝胶网络空间结构,其初始含水率达92%,并在10 h内达到溶胀平衡,但力学性能降低。辐射交联与冻融循环相结合的方法有利于提高胶原水凝胶制备效率,胶原结构不改变,其体外细胞存活率从PVA/PVP水凝胶的77.3%提高到93.8%,细胞相容性提高。     

多孔n-HA/PVA/CS复合水凝胶的制备与抑菌性能研究

以纳米羟基磷灰石、聚乙烯醇、壳聚糖为原料,采用物理交联法制备复合水凝胶(n-HA/PVA/CS),并测定其含水率、力学强度及微观结构。采用比浊法和平板计数法测定n-HA/PVA/CS复合水凝胶在酸性条件下的最低抑菌浓度和抑菌率,同时对比研究其对革兰氏阴性菌大肠杆菌(E.coli)和革兰氏阳性菌金黄色葡萄球菌(S.aureus)的抑菌性。结果表明,n-HA/PVA/CS复合水凝胶具有均匀分散的三维多孔结构,含水率75%,拉伸强度0.26 MPa。经过2%(质量分数)的醋酸溶液处理的n-HA/PVA/CS复合水凝胶材料对S.aureus和E.coli的最低抑菌质量浓度均为0.5 g/L;在该复合水凝胶质量浓度为2.0 g/L时,对S.aureus的抑菌率为84%,对E.coli的抑菌率达到99%,当其样品质量浓度为2.5 g/L时,对E.coli抑菌率接近100%。n-HA/PVA/CS复合水凝胶可望成为性能优良的人工角膜支架材料。     

基于PHMG的丙烯酰胺/琼脂双网络抗菌水凝胶

以琼脂（Agar）、丙烯酰胺（Am）、单宁酸（TA）、氧化石墨烯（GO）为主要原料制备双网络水凝胶辅料。通过TA将GO还原成rGO，以TA/rGO为微反应器与聚六亚甲基胍酸盐（PHMG）反应，将其固定于水凝胶骨架中，制备双网络抗菌水凝胶。对凝胶进行力学性能、热力学性能、抗菌性能等测试。结果表明，琼脂的加入使凝胶的断裂伸长率提高了60%，抗压强度提高，凝胶内部孔隙进一步缩小，力学性能得到提高；质量分数为2.0%PHMG水溶液浸泡后得到的抗菌水凝胶对大肠杆菌和金黄色葡萄球菌的抑菌率均达到99.80%以上；无抑菌圈形成，说明PHMG被固定于凝胶中；红细胞（RBC）溶血实验表明凝胶溶血率均低于5%，抗菌水凝胶有着良好的生物相容性。     

负载白芨多糖的PU/PAM双网络水凝胶的制备与性能

采用聚乙二醇、Ymer N120、聚丙二醇和异佛尔酮二异氰酸酯为原料,以三乙醇胺作交联剂合成聚氨酯(PU)预聚物,浸入白芨多糖(BSP)和丙烯酰胺(AM)混合溶液,通过自由基聚合制备了负载BSP的PU/PAM双网络水凝胶.采用FTIR、SEM对水凝胶的结构和形貌进行了表征,通过拉力试验机和生物实验对其力学性能和生物性能进行了测试.结果表明,当三乙醇胺用量为多元醇物质的量的60％时,双网络水凝胶具有高溶胀率(256％)的同时保持一定的拉伸强度(1.9 MPa)和高压缩强度(22.7 MPa).双网络水凝胶具有抗菌抗氧化作用,其中,双网络水凝胶对大肠杆菌和金黄色葡萄球菌的抑菌带宽度分别为0.5～4.0和0.5～3.5 mm,羟基自由基清除率最高为28％;溶血率低于5％,细胞存活率最高达101.3％±3.6％,表明双网络水凝胶具有良好的生物相容性.     

Preparation and electroresponsive property of poly(vinyl alcohol)/sodium alginate composite hydrogel

Poly(vinyl alcohol) (PVA)/sodium alginate composite hydrogel was prepared by solidifing the blending solution of PVA and sodium alginate, then freezing and thawing repeatedly. In the direct current electric field, the composite hydrogel in aqueous NaCl solution swelled, contracted, and bent. The gel's bending speed and maximum bending degree increased with increase in the electric field intensity and the concentration of NaCl solution. The maximum bending degree increased with increase in the sodium alginate content in the composition hydrogel. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3493–3496, 2006     

Enhancement of Pb(II) Adsorption and Antibacterial Performances of Sodium Alginate/Acrylic Acid Composite Hydrogel via Snowflake-like ZnO Modification

ABSTRACT

Hydrogel materials, due to their special three-dimensional network structure that can be used as adsorbents. The hydrogel combined with the inorganic nanomaterials has superior adsorption performance. Herein, we report that a snowflake-like nZnO/SA-co-AA composite hydrogel (NZCH) with a double network structure is synthesized via graft copolymerization of nano zinc oxide (nZnO) with sodium alginate (SA) and acrylic acid (AA). The hydrogel exhibits the adsorption efficiency of 200 mg/g, has a good effect in adsorbing Pb(II). Meanwhile, the hydrogel has an antibacterial activity against Escherichia coli of 99%. It holds broad prospects for obtaining this multifunctional hydrogel in the field of adsorbing Pb(II).