共查询到16条相似文献,搜索用时 140 毫秒
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聚偏氟乙烯膜表面丙烯酸接枝改性研究 总被引:6,自引:0,他引:6
采用自由基接枝聚合反应制备了丙烯酸改性的聚偏氟乙烯膜,研究了单体浓度对接枝率的影响,测定了改性后样品的红外光谱、表面接触角、水通量、蛋白吸附等.结果表明,通过自由基接枝聚合,丙烯酸接枝到膜的表面,明显提高膜的亲水性.接枝后膜的水通量也非常明显下降,特别是在高丙烯酸浓度下.改性的膜的通量对溶液的pH值有明确的响应关系,表明接枝链在水中的溶胀对膜的性能有显著的影响.蛋白吸附实验表明,改性后的膜相比未改性膜有较高的吸附量,而且在酸性情况下,膜的吸附量较大,这主要与丙烯酸和蛋白质之间的相互作用有关. 相似文献
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采用改进的水蒸气(或称水雾蒸气)诱导成膜的方法制备强疏水性的聚偏氟乙烯(PVDF)微孔膜.在制膜液中添加了正硅酸乙酯(TEOS),水蒸气中添加了碱后,制备的PVDF/Si杂化微孔膜的疏水性更强,水接触角得到较大提高.实验初步考察了TEOS的浓度、环境相对湿度、蒸汽中凝胶时间和蒸汽中碱的浓度对膜表面接触角的影响.结果表明,在一定范围内,膜上表面的接触角随TEOS的浓度、相对湿度和蒸汽中凝胶时间的增加而增大.扫描电镜(SEM)和原子力显微镜(AFM)照片显示,改进的蒸汽诱导法形成的杂化膜上表面无致密皮层,呈网状多孔结构并附着微米级的球形颗粒,且蒸汽中适宜的碱浓度有利于球状颗粒的形成和长大;断面呈对称的海绵状结构. 相似文献
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以经碱处理的聚偏氟乙烯(PVDF)和N-异丙基丙烯酰胺(NIPA)作为聚合单体,分别采用偶氮二异丁腈(AIBN)和过氧化苯甲酰(BPO)作为引发剂,合成了PVDF-g-PNIPA接枝共聚物.设计了反应时间、单体配比和反应温度三因素三水平的正交试验,并通过红外光谱和核磁共振谱对产物进行表征,计算接枝率.讨论了反应条件及不同的引发剂对接枝率的影响.结果表明:AIBN引发剂在较高温度、较长反应时间下有着更高的接枝率;而BPO引发剂在较低温度、较短反应时间下比相同条件下的AIBN更优秀. 相似文献
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Poly(e-caprolactone) (PCL) is a favorable material for tissue engineering. PCL was successfully fabricated into less than 10 μm thin membranes using a 2-roll-heated-mill and biaxial stretching process. However, PCL is known for its poor cellular adhesion and surface modifications are needed for any tissue engineering applications. This paper reports on a novel surface modification technique of the PCL membrane by coating with electrospun nanofibers. The purpose was to mimic the architecture of the natural extracellular matrix and create nanotopography for enhanced cellular attachment. The surfaces were characterized by scanning electron microscopy (SEM), water contact angle and atomic force microscopy. The results showed that uniform nanofibrous topology were successfully achieved on the surface of the PCL membrane, with increased roughness (more than 17 times) and surface area. This nanofibrous topology induced capillary effects after sodium hydroxide (NaOH) treatment, causing the water contact angle to drop to almost zero. Scratch tests revealed a strong interaction of PCL nanofiber coating on the PCL membrane. AlamarBlue assay indicated that 3T3 fibroblast cells proliferated well on the nanofibrous membrane. Confocal Laser Scanning Microscope revealed better cell attachment onto the nanofibrous membranes than the untreated membranes. Results from SEM showed that the cells' spindle-shaped morphology on the NaOH-treated fibrous surface was evident while they remained in isolated spherical shaped entities in the non-treated fibrous surfaces. 相似文献