共查询到19条相似文献,搜索用时 62 毫秒
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采用1,4-二氨基蒽醌作为发色体,与异佛尔酮二异氰酸酯反应生成紫色预聚物,与聚乙二醇600通过界面聚合法制备了氨基蒽醌紫色聚氨酯微球。考察了乳化剂种类、用量、乳化速度、发色体用量对微球粒径的影响。结果表明:与聚氧乙烯辛基苯酚醚-10、失水山梨醇单油酸酯聚氧乙烯醚(Tween80)和失水山梨糖醇单油酸酯(Span80)相比,十二烷基苯磺酸钠(SDBS)乳化剂更适合用于聚氨酯球的制备。SDBS质量分数3.5%(以油相为基准)的粒径分布最窄,微球粒径在350nm左右。微球平均粒径随乳化速度增大而减小,在8000r/min粒径分布最集中。发色体在壳层体系中加入量为1mmol时粒径分布系数最小,平均粒径在500nm。通过SEM和TEM表征,结果显示:聚氨酯微球粒径在500nm左右,表面光滑的球形,内部呈空心结构。氨基蒽醌聚氨酯紫色微球印花织物颜色性能优异,且具有较高色牢度。 相似文献
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用八甲基环四硅氧烷(D4)、1,3-双(3-氨基丙基)-1,1,3,3-四甲基二硅氧烷通过本体聚合,制备氨丙基封端的聚硅氧烷(ASO-2),再将其与异佛尔酮异氰酸酯(IPDI)、聚乙二醇1000(PEG-1000)和三乙醇胺(TEOA)制备的聚氨酯预聚体(PU)反应,制得IPDI型阳离子水性聚氨酯改性氨基硅整理剂(PUASO-2)。利用IR、FESEM、纳米粒度仪等对PUASO-2及其乳液进行研究。研究表明,通过外乳化法制备的PUASO-2乳液(PUAS-2)粒子分布集中,平均粒径为38.64 nm。当聚氨酯PU的质量分数为20%时,对斜纹棉和平纹棉分别处理,整理后,弯曲刚度分别达到954、525 mN,折皱回复角达到178.86°、272.81°,与未整理前两种棉织物相比,分别增幅23%、26%和37%、35%。与ASO-2整理后的两种棉织物相比,PUAS-2整理后两种棉织物的白度分别由78.18 wb、73.45 wb提高到81.13 wb、76.64 wb,织物的折皱回复角分别由140.44°、205.65°提高到174.71°、269.02°,而静态吸水时间提高到1.78~2.68 s,柔软度均略有下降。 相似文献
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本文研究了苯乙烯,丙烯酸等单体在磁性氧化铁的醇/水分散体系中的聚合行为。为了改善磁性氧化铁粒子与苯乙烯单体间的亲合性,加入聚乙二醇作为发散剂和稳定剂,制备出业径为30-1000μm的具有磁响应性的聚苯乙烯微球。 相似文献
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分子印迹聚合物微球的粒径尺寸及分布 总被引:3,自引:0,他引:3
印迹技术是近年来发展起来的基于模拟抗体-抗原相互作用原理的新技术,广泛应用于手性物质拆分、仿生传感器、固相萃取、抗体模拟等领域。悬浮聚合法是制备分子印迹聚合物微球最常用的方法,本文就影响悬浮聚合法制备分子印迹聚合物微球粒径尺寸及分布的因素进行了探讨。 相似文献
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采用乳液聚合协同碱渗透溶胀法,制备了亚微米中空微球聚合物。通过SEM、TEM、DLS分别对中空微球的形貌和粒径进行表征,并考察了中空微球聚合物的遮盖性能。研究了引发剂用量对核粒径的影响,中间层和壳层聚合物配比对微球形貌结构及其遮盖性能的影响。结果表明,在核制备过程中,核的粒径随引发剂用量的增加而减小;对于平均粒径为148 nm的核,当中间层甲基丙烯酸丁酯(BMA)用量为10 wt%、甲基丙烯酸(MAA)用量为3 wt%,甲基丙烯酸甲酯(MMA)用量为87 wt%,壳层苯乙烯(St)用量为97 wt%,交联剂用量为3 wt%时,可制备平均粒径414 nm,中空率为40.6 %的聚合物微球,且微球表面较为光滑,此时中空微球聚合物具有优异遮盖性能,遮盖度达到66 %。 相似文献
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以甲基丙烯酸(MAA)、甲基丙烯酸甲酯(MMA)、甲基丙烯酸丁酯(BMA)、苯乙烯(St)、三羟甲基丙烷三丙烯酸酯(TMPTA)为原料,采用乳液聚合协同碱渗透溶胀法,制备了亚微米中空聚合物微球(HPM)。通过SEM、TEM、DLS分别对HPM的形貌和粒径进行了表征,并考察了HPM的遮盖性能。考察了引发剂用量对核粒径的影响、中间层和壳层聚合物质量比对HPM形貌结构及其遮盖性能的影响。结果表明:在核制备过程中,核的粒径随引发剂用量的增加而减小;对于平均粒径为148 nm的核,当中间层m(MAA)∶m(BMA)∶m(MMA)=3∶10∶87,壳层m(St)∶m(TMPTA)=97∶3时,可制备平均粒径414 nm、中空率为40.6%的HPM,且HPM表面较为光滑,此时HPM具有优异的遮盖性能,遮盖度达到66%。 相似文献
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以低相对分子质量生物可降解D,L-聚乳酸(D,L-PLA)二醇和六亚甲基二异氰酸酯(HDI)为原料、1,4-丁二醇(BD)为扩链剂及聚乙烯基吡咯烷酮(PVP)为悬浮剂,通过悬浮聚合法初步合成了一种新型聚氨酯微球(PUMS)。用扫描电子显微镜(SEM)考察了BD的含量对微球表面形态的影响,通过激光粒度分析仪讨论了搅拌速率和PVP浓度对微球粒径及其分布的影响,用傅立叶变换红外光谱(FTIR)粒度分析仪对微球的化学结构进行了表征。结果表明,合成的微球的平均粒径随搅拌速率和PVP浓度的增加而减少,粒径分布变宽;当搅拌速率为400r/min,PVP质量分数为1.5%时。微球的平均粒径约47μm,粒径分布最窄。约在10~90μm;微球表面有孔,但随着BD含量的增加,微球表面变得相对粗糙,孔数减少,孔径减小,直至孔消失。 相似文献
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介绍了聚氨酯微球的几种制备方法及其特点,包括悬浮聚合法、反相悬浮聚合法、自乳化法、分散聚合法、SPG膜乳化法;并对乙烯基聚合物和有机刚性纳米粒子改性聚氨酯微球和应用进行了概述. 相似文献
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本文对聚氨酯彩色聚合物微球的配方、合成工艺进行探索,并对各种影响因素进行了研究,寻找到较为合理的工艺路线。 相似文献
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Polyurethane (PU) microspheres were prepared by a novel and simple method using the condensation polymerization technique. Microspheres of different morphological characteristics were prepared using tolylene 2,4-diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI). These microspheres were fully characterized by thermal analysis, scanning electron microscopy, and spectral techniques. MDI-containing microspheres were found to be more porous as compared to TDI-containing microspheres. The infrared spectra indicated the complete utilization of the isocyanate groups in the synthesis of microspheres. Bromothymol Blue (BTB) was used as a model drug for the in vitro release studies from the spheres. The results indicated that BTB released much faster using the MDI spheres as compared to the TDI spheres. © 1993 John Wiley & Sons, Inc. 相似文献
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Narges Nasehi Gogajeh Jafar Javadpour Bijan Eftekhari Yekta 《Ceramics International》2021,47(14):19895-19905
A low-temperature method was developed to produce bioactive glass microspheres (BGMs). The microspheres were fabricated by dispersing the prepared sol in silicon oil, a process called the sol-microemulsion-gel method. The resulting microspheres were characterized by X-ray diffractometry (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential thermal analysis (DTA), and Brunauer-Emmett-Teller (BET) techniques. Furthermore, the effect of various processing parameters such as reaction chamber size and the stirring rate on microspheres diameter was investigated. The results indicated that under optimized conditions, one could obtain BGMs with acceptable sphericity having a narrow size distribution. The obtained microspheres had diameters in the range of 19.3 ± 9.3 μm. The BET specific surface area was 240.33 m2/g. The results also showed that the increase in the reaction chamber size had interesting contradictory effects on BGMs diameter. The increase in the stirring rate intensified the shear forces exerted on the water-based phase and caused the generation of smaller droplets and microspheres. 相似文献
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In this work synthesis and characterization of inherently X-ray opaque, nonresorbable polyurethane microspheres with well-calibrated particles in a defined range of sizes suitable for embolization is reported. In order to impart X-ray opacity to the polyurethane, a bifunctional monomer, namely, 4,4′-isopropylidenediphenol (BPA) was iodinated and this iodinated compound was used as one of the monomers during polyurethane synthesis. The resultant X-ray opaque polyurethane was converted into microspheres using an oil-in-water emulsion and solvent evaporation technique. Microspheres obtained had diameters in the range of 200–500?µm, were noncytotoxic and free from X-ray attenuating additives. In vivo X-ray fluoroscopic imaging carried out in a rabbit cadaver model showed that these microspheres were sufficiently X-ray opaque to be visualized under fluoroscopic conditions. 相似文献
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以羧甲基壳聚糖(CMCS)、蓖麻油(CO)和异佛尔酮二异氰酸酯(IPDI)为原料,自乳化法制备了羧甲基壳聚糖-蓖麻油基聚氨酯微球(CO-CMCS-PU),通过分子自组装法负载阿维菌素(AVM)得到载药微球(CO-CMCS-PU@AVM)。采用FTIR、1HNMR、SEM、TGA等对产品结构及形貌进行表征,并探究了不同药量载药微球的包封率、缓释性能、抗紫外性能、叶面接触角和黏附性能。结果表明,相比AVM分散液,紫外照射后载药微球中AVM的保留率提高到43%,说明CO-CMCS-PU载体的抗紫外性能良好;载药微球比AVM分散液在黄瓜叶面上的接触角降低了20%以上,滞留量提高了40%以上,说明其在叶面上有较好的黏附性和润湿性;载药微球包封率可达80%以上,具有良好的缓释和pH响应释放性能,释药行为符合First-order动力学模型,药物释放受Fickian扩散控制。 相似文献
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