彩色聚苯乙烯微球的制备

以无机染料和苯乙烯为原料,磷酸三钙(TCP)和聚乙烯醇(PVA)为分散剂,过氧化二苯甲酰为引发剂,通过原位悬浮聚合的方法制备了球度好、有光泽的彩色聚苯乙烯微球。研究了无机染料在苯乙烯中的超声分散时间对分散效果的影响,以及聚合反应过程中分散剂用量、聚合温度、时间对聚合的影响。结果表明:无机染料用量越多,其在苯乙烯中超声分散所需时间越长,分散时间不能小于6 min;较佳聚合条件是分散剂质量比m(TCP):m(PVA)=1:1,采用分段升温反应,先在75℃下反应1 h,然后缓慢升温至85℃反应2 h,最后在95℃下反应0.5 h。通过色差计对彩色聚苯乙烯微球的测试结果表明,随染料添加量的增加,样品的色差变大。     

聚苯乙烯单分散交联纳米微球的制备和表征

以苯乙烯为单体,二乙烯基苯为交联剂、过硫酸钾为引发剂,甲基丙烯酸为稳定剂,通过无皂乳液聚合反应,合成0粒径均匀分布的聚苯乙烯高分子微球.聚苯乙烯纳米微球由于其特定的尺寸和形貌,具有其他材料所不具备的特殊功能.采用无皂乳液聚合法制备了具有单分散性的亚微米级聚苯乙烯球,考察了聚合体系单体对微球粒径的影响.通过研究聚合物微球的自组装工艺,选出最佳条件并制备具有三维有序结构的光子材料.结果表明不同半径的聚苯乙烯微球在白光照射下会显现出不同颜色.可作为填料放到涂料中.     

分散聚合法制备单分散聚苯乙烯微球

用分散聚合法,在乙醇/水介质中,以苯乙烯为单体,偶氮二异丁腈为引发剂,聚乙烯吡咯烷酮为分散剂制备了聚苯乙烯(PS)微球。探讨了制备条件对微球形貌、粒径及粒径分布的影响。结果表明,在合适条件下,可以制备粒径在1μm左右,粒径分布在1.04~1.08,表面光滑且互不粘连的单分散PS微球。     

微米级单分散聚苯乙烯微球的制备

以苯乙烯(St)为单体、偶氮二异丁腈(AIBN)为引发剂、聚乙烯吡咯烷酮(PVP)为分散稳定剂,在乙醇-水反应介质中,采用分散聚合法制备了微米级单分散聚苯乙烯(PS)微球。分别用电镜扫描和激光粒度仪表征了PS微球表面形貌、粒径及粒度分布,探讨了影响PS微球粒径及粒度分布的诸多因素。结果表明,AIBN用量(以单体质量计,下同)大于5.0%或PVP用量(以单体质量计,下同)小于2%时,PS粒子间有聚并现象;当St浓度为10%、AIBN用量为2.5%、PVP用量为5.5%、醇水质量比为90∶10、聚合温度为70℃时,制备的PS微球粒径为1.612μm、粒度分散系数为0.357,微球单分散性及球形度最佳。     

单分散聚苯乙烯微球的研究进展

单分散的聚苯乙烯微球具有诸多优点,如聚集作用大,吸附性强,比表面积大及表面反应强等。本文从悬浮聚合、分散聚合、乳液聚合、无皂乳液聚合和种子溶胀聚合等聚合方法的角度,综述了单分散聚苯乙烯微球的制备方法及研究进展。     

交联型单分散聚苯乙烯微球的制备

以聚乙烯吡咯烷酮（PVP）为分散剂，偶氮二异丁腈（AIBN）为引发剂，乙醇为分散介质，二乙烯基苯（DVB）为交联剂进行了苯乙烯（St）的分散聚合；讨论了引发剂、交联剂、分散剂、单体用量对聚合物粒径及分布的影响，制备了交联型单分散聚苯乙烯微球。实验表明：当交联剂质量分数达到单体质量分数的1％时，微球依然可以保持良好的单分散性。在聚合体系中引入抗坏血酸，使其与微量的氧结合，有效地提高了微球的均匀度。     

微米级单分散聚苯乙烯微球的研究进展

综述了近年微米级单分散聚苯乙烯(PS)微球的研究状况和技术进展,重点讨论了反应单体、引发剂、分散剂、反应介质等对微球粒径及粒径分布的影响,并对PS微球的制备方法进行了介绍。最后对今后PS微球的发展趋势及应用前景进行了分析和展望。     

新型磁性聚苯乙烯微球的制备及表征

为了制备一种以四氧化三铁磁性纳米粒子为壳、聚苯乙烯为核的新型高分子功能材料,并有望应用于磁稳定流化床反应器,采用悬浮聚合法制备了四氧化三铁纳米粒子包覆聚苯乙烯的磁性微球。运用扫描电镜（SEM）、红外光谱（FT-IR）、振动样品磁强计（VSM）、热失重（TGA）等测试手段,分析并表征了磁性聚苯乙烯微球的形貌特征、粒径、磁学性能及四氧化三铁包覆量。实验结果表明,所得磁性聚苯乙烯粒子为球状微球,粒径为150~200 μm且分布较窄;磁性聚苯乙烯微球的四氧化三铁包覆量达到7.81%（质量分数）,最高饱和磁化强度为3.97 A·m2/kg。     

单分散大粒径交联聚苯乙烯微球的制备及功能化改性的研究进展

单分散的聚合物功能微球具有许多突出优点,如比表面积大、表面反应能力强等。系统地分析和综述了单分散交联聚苯乙烯功能微球的制备方法及应用的最新研究进展,并对该类功能材料的发展前景进行了预测。     

聚苯乙烯多孔吸附微球的制备

通过悬浮聚合和超交联两步法合成了具有介孔结构的改性聚苯乙烯微球用作血液净化材料。首先采用悬浮聚合法制备了亲水改性的苯乙烯马来酸酐共聚微球（MPPS）,然后将MPPS微球以二氯甲烷为溶剂、无水氯化铝为催化剂进行后交联处理,制备了含有介孔结构的、具有较高比表面积的聚苯乙烯(HCLPS)多孔微球。采用比表面积测试、扫描电子显微镜、傅里叶红外光谱、X射线光电子能谱等仪器分析表征了微球的结构和形貌,并测试了HCLPS微球的吸水性和戊巴比妥钠吸附性能。结果表明,超交联反应可以显著提高微球的比表面积,并且随着马来酸酐(MAH)含量增加,微球的吸水性和戊巴比妥钠吸附性能提高;当MAH含量为20 %（质量分数,下同）时HCLPS微球的戊巴比妥钠吸附率为91.90 %。     

用WPSt制备大颗粒聚合物P(PS/VAc)的工艺研究

以聚苯乙烯(PSt)泡沫为原料,采用悬浮法制备大颗粒聚合物P(PS/VAc)。着重探讨了分散剂加入方式及用量、引发剂用量、水介质的用量、聚苯乙烯泡沫的用量等对其粒径及分布的影响,确定了产品粒径主要位于2~4mm的聚合工艺条件。     

细乳液聚合制备二氧化钛/聚苯乙烯复合微球及其形貌分析

采用细乳液聚合法,以γ-甲基丙烯酰氧基丙基三甲基硅烷改性的TiO2粒子为核,制备了核壳结构的TiO2/聚苯乙烯(PS)复合微球。研究了超声细乳化时间、乳化剂十二烷基硫酸钠(SDS)的浓度、TiO2用量对细乳液粒径及其分布的影响。通过纳米粒度与Zeta电位分析仪、红外光谱、透射电镜等分析手段对产物进行了表征。结果表明,随着超声细乳化时间的增加,初始液滴的粒径变小。聚合后的乳胶粒粒径随着SDS浓度的增大而减小;TiO2用量不足导致乳胶粒粒径分布变宽,且出现双峰;制备所得的TiO2/PS复合微球粒度分布较为均匀,平均直径为176.5 nm,球形规整度较好。     

Preparation and characterization of monodisperse molecularly imprinted polymer microspheres by precipitation polymerization for kaempferol

A new kind of molecularly imprinted polymer (MIP) microspheres for the selective extraction of kaempferol was prepared by precipitation polymerization using 4-vinylpridine (4-VP) and ethylene glycol dimethacrylate (EDMA) as functional monomer and cross-linker respectively. The synthesis conditions, such as ratios of 4-VP/EDMA and polymerization time were discussed in detail. Results showed that the 2% was the optimal concentration of co-monomers to obtain monodisperse MIP microspheres, the best ratio of 4-VP/EDMA was 1:2, and 24 h was considered as the proper polymerization time. Compared with the MIP agglomeration or coagulum particles, monodisperse MIP microspheres showed the better adsorption capacity: the saturated adsorption capacity of monodisperse MIP microspheres was 7.47 mg g^?1, the adsorption equilibrium could be obtained in 30 min. Finally, the adsorption performances of the optimal MIP microspheres were evaluated by kinetic adsorption, adsorption isotherm, and selective adsorption experiments, which indicated that the adsorption mechanism were chemical single layer adsorption and the separation factor was up to 3.91 by comparing with the structure similar compound (quercetin). The MIP microspheres exhibit prospects in the kaempferol efficient and selective separation.     

The influence of water on size of the monodisperse polystyrene microspheres prepared by dispersion polymerization

Polystyrene microspheres with uniform sizes have a wide range of applications in biomedical engineering. However, detailed and systematic investigations on the influence of water content on alcohol/water systems are relatively scarce. In this study, the impact of trace water content on microsphere size was comprehensively examined, and a systematic exploration of the varying effects of different hydration levels on particle nucleation and growth mechanisms was conducted. When the water content increased from 0.1% to 0.4%, the microsphere diameter rapidly decreases from 3.6 to 2.71 μm. Correspondingly, the molecular weight increased from 29,797 to 69,186. However, within the water content range of 0.5%–14.5%, alterations in water content induced only slight variations in the microsphere diameter. The microsphere size, molecular weight, conversion rate, and reaction rate were compared in two stages. It was observed that the diminishing influence of water on the system was due to the changes in the main polymerization sites. Subsequently, the addition of water content up to 33.5% revealed an exponential decrease in the microsphere size with increasing water content in ethanol. This pattern was also observed in methanol and isopropanol, demonstrating its universality and predictability, making it applicable for precise prediction of microsphere size in different solvents.     

石墨/PS复合材料的制备与表征

以鳞片石墨和聚苯乙烯为原料,采用悬浮聚合的方法制备出石墨/PS复合材料,并对此材料的结构和性能进行了表征.实验结果表明,以石墨为填料对PS进行改性,可有效地改善PS的导热性能.     

Preparation and properties of magnetic polystyrene microspheres

Magnetic polystyrene nanospheres were efficiently prepared by using a new indirect process based on miniemulsion polymerization of styrene. The samples were characterized by X‐ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), and vibrating‐sample magnetometry (VSM), respectively. The experimental results clearly show that the 3‐methacryloxypropyltrimethoxy silane was anchored onto the surface of the magnetic particles to form the vinyl end. The size of the magnetic particle is about 6–30 nm. The size of the magnetic particle capped with polystyrene is about 1–2 μm. The magnetic polystyrene spheres exhibit multidomain character, whereas the pure magnetic particles show single domain character. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3660–3666, 2007     

Study of the preparation and mechanism of formation of hollow monodisperse polystyrene microspheres by SPG (Shirasu Porous Glass) emulsification technique

In a previous study, it was found that monodisperse polystyrene (PSt) hollow particles can be prepared under special conditions by combining a Shirasu Porous Glass (SPG) emulsification technique and subsequent suspension polymerization process. That is, a mixture of styrene (St), N,N‐dimethylamino ethyl methacrylate (DMAEMA), hexadecane (HD), and initiator N, N′‐azobis(2,4‐dimethylvaleronitrile) (ADVN) was used as the dispersed phase in an aqueous phase containing poly(vinyl pyrrolidone) (PVP), sodium lauryl sulfate (SLS), and water‐soluble inhibitor. The dispersed phase was created by pushing the oil phase through the uniform pores of an SPG membrane into the continuous phase to form uniform droplets. Then, the droplets were polymerized at 70°C. It has been puzzling that hollow microspheres were obtained only when sodium nitrite (NaNO₂) was used as a water‐soluble inhibitor, while one‐hole particles were formed when hydroquinone (HQ) or diaminophenylene (DAP) was used. In this study, the mechanism of formation of the hollow microspheres was verified by measuring the variation of diameter, molecular weight distribution, and monomer conversion, and by observing morphological changes during the polymerization, as well as by changing the type and amount of hydrophilic monomer, and initiator. It was found that the diameter of the oil droplets decreased, and a large amount of secondary new particles formed immediately after polymerization started in the case of NaNO₂. However, there was no such apparent behavior to be observed when HQ or DAP was used. It was determined that the hollow particles formed due to the rapid phase separation between PSt and HD, and as a consequence, a large amount of monomer diffused into the aqueous phase to form the secondary particles. Rapid phase separation confined the HD inside the droplets, a nonequilibrium morphology. On the other hand, one‐hole particles, representing an equilibrium morphology, formed when the phase separation occurred slowly because a lot of monomer existed inside of the droplets to allow mobility of the PSt. The addition of DMAEMA allowed the hollow particles to be formed more easily by decreasing the interfacial tension between the copolymer and aqueous phase. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1530–1543, 2002     

糠醛渣木质素/聚乙烯亚胺微球的制备

木质素和聚乙烯亚胺（PEI）对重金属离子有良好的亲和力,且木质素来源广泛、具有良好的生物降解性能,在水处理方面有很好的前景。本文以糠醛渣木质素和聚乙烯亚胺为主要原料,十二烷基苯磺酸钠（SDBS）为分散剂,环氧氯丙烷（EPI）为交联剂,液体石蜡为油相,采用反相悬浮聚合法,制备了糠醛渣木质素/PEI微球（LMS）。通过FTIR、XRD、SEM和激光粒度仪对微球的结构和形貌进行表征,研究了木质素用量、PEI用量、EPI用量、SDBS用量、油水比和反应温度对木质素微球制备的影响。结果显示,在木质素用量为0.600g,PEI用量为2.25g,EPI用量为2.25mL,SDBS用量为0.075g,温度为56℃,油水体积比为4.5∶1的条件下,制得的糠醛渣木质素/PEI微球平均粒径为135μm,粒径分散度为0.290,比表面积为46.5m²/g,球型度良好,球体表面有少量微孔。     

微米级聚苯乙烯/聚硅氧烷核壳微球的制备、表征及其作为光散射剂的应用

在乙醇/水混合溶剂中采用分散聚合法制备出微米级聚苯乙烯微球,将聚苯乙烯核微球与甲基三甲氧基硅烷的水解溶液混合,加入氨水使硅烷水解产物在核表面缩合交联,制备出微米级聚苯乙烯/聚硅氧烷核壳微球.采用TEM、粒径分布仪、EDX、TG等对核壳微球的形貌、粒径、表面成分和热失重进行了表征.将核壳微球作为光散射剂添加在聚甲基丙烯酸甲酯（PMMA）树脂中,制备出性能良好的光散射材料.当SS6核壳微球的添加浓度为1%（质量）时,制得的PMMA样片（2 mm）的雾度为88.16％,透光率为72.5％;当SS6添加浓度为2%（质量）时,其雾度为92.13％.