氨基胍功能化树脂的制备及其对Cd~(2+)的吸附性能研究

以D301树脂为载体,通过接枝于D301树脂表面的单体甲基丙烯酸缩水甘油酯(GMA)上的环氧键与氨基胍盐酸盐发生开环反应,成功制备出一种富含氨基基团的新型吸附材料AHD301。采用傅里叶红外光谱仪对其结构进行表征,并且研究了功能吸附材料对Cd~(2+)的吸附性能。结果表明,在298 K,pH为6.8的条件下,AHD301对Cd~(2+)的吸附效率可达97.9%,最大吸附量为535.5 mg/g。并且,AHD301具有较好的重复使用性能。     

硫脲改性D301树脂的制备及其对AuCl_4~–的吸附性能

使用硫脲对一种苯乙烯系阴离子交换树脂——D301树脂进行改性,先在D301树脂大分子链上接枝聚甲基丙烯酸缩水甘油酯(PGMA),然后通过硫脲与PGMA的环氧基的开环反应制得硫脲改性D301树脂(TD301)。对TD301进行了扫描电子显微镜、傅里叶变换红外光谱、元素分析等表征,研究了硫脲改性条件对TD301吸附性能的影响,并考察了TD301对AuCl_4~–的吸附动力学行为。结果表明,TD301适宜的硫脲改性条件为硫脲用量2 g,反应温度90℃,反应时间8 h;在环境温度25℃,氯金酸溶液pH值为2的情况下,所制得的TD301对AuCl_4~–的吸附量可以达到300.4 mg/g;此外,TD301具有优良的再生与重复使用性能。     

氨基胍功能化树脂的制备及其对Cd~(2+)的吸附性能研究

以D301树脂为载体,通过接枝于D301树脂表面的单体甲基丙烯酸缩水甘油酯(GMA)上的环氧键与氨基胍盐酸盐发生开环反应,成功制备出一种富含氨基基团的新型吸附材料AHD301。采用傅里叶红外光谱仪对其结构进行表征,并且研究了功能吸附材料对Cd⁽²⁺⁾的吸附性能。结果表明,在298 K,pH为6.8的条件下,AHD301对Cd(2+)的吸附性能。结果表明,在298 K,pH为6.8的条件下,AHD301对Cd⁽²⁺⁾的吸附效率可达97.9%,最大吸附量为535.5 mg/g。并且,AHD301具有较好的重复使用性能。     

阴离子型离子交换树脂D301-g-PDMC的制备及其对AuCl_4~-的吸附性能初探

通过溶液中的过硫酸铵与D301树脂表面的叔胺基形成氧化-还原引发体系,将水溶性阳离子烯类功能单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝到D301树脂表面,制得了新型阴离子型离子交换树脂D301-g-PDMC。考察了主要接枝条件(时间、温度、引发剂及单体用量)对接枝度的影响,并研究了D301-g-PDMC对AuCl_4~-的吸附性能。结果表明,反应时间为10 h,反应温度为35℃,过硫酸铵用量为1.6%,DMC用量为17 m L时,PDMC的接枝度最高,可达26.67%。D301-g-PDMC对AuCl_4~-有很强的吸附能力,吸附容量可以达到748.03 mg/g。此外,D301-g-PDMC对AuCl_4~-的吸附效率可达97.83%。     

D301树脂的季铵化改性及其对AuCl_4~-的吸附性能研究

以二甲基二烯丙基氯化铵(DMDAAC)为单体,过硫酸铵为引发剂,将单体接枝聚合于D301树脂上,制备了新型接枝树脂D301-g-PDMDAAC。采用FTIR对其结构进行了表征,探讨了制备条件对AuCl^-_4吸附量的影响。结果表明,反应时间为10 h,反应温度为40℃,DMDAAC用量为10 mL,过硫酸铵为单体用量的1%(质量分数)时,D301-g-PDMDAAC对AuCl-_4吸附量的影响。结果表明,反应时间为10 h,反应温度为40℃,DMDAAC用量为10 mL,过硫酸铵为单体用量的1%(质量分数)时,D301-g-PDMDAAC对AuCl^-_4的吸附量可以达到371.92 mg/g,并且有着良好的重复使用性能。     

阴离子型离子交换树脂D301-g-PDMC的制备及其对AuCl_4~-的吸附性能初探

通过溶液中的过硫酸铵与D301树脂表面的叔胺基形成氧化-还原引发体系,将水溶性阳离子烯类功能单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝到D301树脂表面,制得了新型阴离子型离子交换树脂D301-g-PDMC。考察了主要接枝条件(时间、温度、引发剂及单体用量)对接枝度的影响,并研究了D301-g-PDMC对AuCl_4^-的吸附性能。结果表明,反应时间为10 h,反应温度为35℃,过硫酸铵用量为1.6%,DMC用量为17 m L时,PDMC的接枝度最高,可达26.67%。D301-g-PDMC对AuCl_4-的吸附性能。结果表明,反应时间为10 h,反应温度为35℃,过硫酸铵用量为1.6%,DMC用量为17 m L时,PDMC的接枝度最高,可达26.67%。D301-g-PDMC对AuCl_4^-有很强的吸附能力,吸附容量可以达到748.03 mg/g。此外,D301-g-PDMC对AuCl_4-有很强的吸附能力,吸附容量可以达到748.03 mg/g。此外,D301-g-PDMC对AuCl_4^-的吸附效率可达97.83%。     

新型阳离子交换树脂D301-g-PSSS的制备及其对金属离子的吸附性能

利用D301树脂表面的氨基与过硫酸铵构成氧化–还原引发体系,实现了单体对苯乙烯磺酸钠在D301树脂表面的接枝聚合,制得D301树脂表面接枝聚对苯乙烯磺酸钠(PSSS)(D301-g-PSSS)吸附材料。采用傅立叶变换红外光谱对D301-g-PSSS进行了表征,并用称重法和滴定法测定了其接枝率,在适宜条件下的接枝率分别达到17.7%,17.3%。考察了D301-g-PSSS对Al3+,Cu2+,Fe3+的吸附性能。D301-g-PSSS对3种金属离子具有很强的吸附能力,最大吸附容量可分别达到13.285,14.864,15.10 mg/g。3种金属离子的等温吸附符合Langmuir等温吸附模型,平衡吸附容量随着pH值的增大而增大,随着温度的升高而减小。D301-g-PSSS具有较好的重复利用性,重复使用6次D301-g-PSSS吸附Fe3+,其吸附容量变化不大。     

PGMA/(Al)_2O_3制备及其对环氧树脂体系性能的影响

将带有环氧基的功能性单体甲基丙烯酸缩水甘油酯(GMA)接枝聚合在微米级氧化铝颗粒表面,制备了接枝微粒PGMA/(Al)_2O_3。考察了各种因素对接枝率的影响;利用红外光谱、扫描电镜表征了PGMA/(Al)_2O_3;并通过扫描电镜观察了PGMA/(Al)_2O_3在环氧树脂中的分散情况,初步研究了PGMA/(Al)_2O_3对环氧树脂体系的增强增韧性能。结果表明:表面引发自由基聚合反应可以成功制备复合粒子PGMA/(Al)_2O3,其接枝率随引发剂浓度和氧化铝与GMA质量比的增大先增大后减小;将PGMA/(Al)_2O_3填充到环氧密封材料中后,氧化铝颗粒在环氧树脂中分散良好,其复合材料的韧性明显高于未改性Al2O3填充的复合材料。     

硅胶负载TEMPO催化剂的制备及其分子氧氧化肉桂醇反应过程中催化性能

构建了巯基/偶氮二异丁腈(—SH/AIBN)氧化还原引发体系,成功地实施了单体甲基丙烯酸缩水甘油酯(GMA)在微米级硅胶微粒表面引发接枝聚合,制得接枝微粒PGMA/SiO_2。然后,以4-羟基-2,2,6,6-四甲基哌啶氮氧自由基(4-OHTEMPO)为试剂,使PGMA/SiO_2微粒表面的环氧基团发生开环反应,从而制得TEMPO固载微粒PGMA/SiO_2-TEMPO,并研究了主要因素对固载化反应的影响,同时采用多种方法对产物进行表征。最后,将PGMA/SiO_2-TEMPO与Fe(NO_3)_3组成共催化体系,催化氧化肉桂醇。结果表明,共催化体系在适宜条件下可有效地催化氧化肉桂醇,得到单一产物肉桂醛,反应16 h肉桂醛的产率可达88%。此外,该催化剂具有良好的循环使用性能。     

GMA光接枝改性涤纶织物的微观结构与性能（英文）

基于紫外线照射引发技术,将甲基丙烯酸缩水甘油酯(GMA)光接枝共聚到涤纶针织物和机织物表面,并对两种接枝织物的微观结构与水润湿性进行表征。结果表明:随着单体GMA含量的增加,接枝率增加,随着光敏剂、交联剂含量增加及光照时间的延长,接枝率呈现先增加后降低的趋势;针织物的扁平和变形纤维及织物表面的毛羽效果有利于GMA的吸附和接枝聚合,而机织物的圆形、刚性纤维及紧密堆积结构不利于GMA的吸附和接枝聚合;GMA质量分数为36%时,涤纶针织物的接枝率达83.7%,接枝后针织物的水接触角从125.3°降至77.2°;涤纶织物的纤维形态和纱线的结构决定单体的吸附和接枝效果。     

Preparation of iminodiacetic acid-type composite chelating material IDAA-PGMA/SiO2 and preliminary studies on adsorption behavior of heavy metal ions and rare earth ions

A kind of iminodiacetic acid (IDAA)-type composite chelating materials was prepared by first graft polymerization and subsequent polymer reaction. Monomer glycidyl methacrylate (GMA) was grafted on micron-sized silica gel particles in the manner of “graft through” in a solution polymerization system, resulting in the grafted particles poly(glycidyl methacrylate) (PGMA)/silicon dioxide (SiO₂). Subsequently, the ring-opening reaction of the epoxy groups of the grafted PGMA was carried out with IDAA as reaction reagent, resulting in the bonding of IDAA groups onto PGMA/SiO₂ and obtaining the composite chelating material IDAA-PGMA/SiO₂ particles. The effects of the main factors on the graft polymerization of GMA and the bonding reaction of IDAA were examined emphatically, and the adsorption behavior of IDAA-PGMA/SiO₂ particles toward several kinds of heavy metal ions and rare earth ions was preliminarily explored. The experiments results show that: (a) to obtain the grafted particles PGMA/SiO₂ with high grafting degree, in the graft polymerization step, the reaction temperature and the used amount of initiator should be controlled. The suitable temperature is 70°C and the appropriate used amount of initiator is 1.4 % of the monomer mass. Under the optimal conditions, the grafted degree of PGMA can reach 17.50 g/100 g. (b) It is feasible to introducing of IDAA groups onto PGMA/SiO₂ particles via ring-opening reaction of epoxy groups of the grafted PGMA under alkaline conditions, and the bonding rate of IDAA group can get up to 70% based on epoxy groups of the grafted PGMA. (c)The composite chelating material IDAA-PGMA/SiO₂ possesses very strong chelating adsorption ability for heavy metal ions, and especially toward Pb²⁺ ion, the adsorption capacity can reach 24 g/100 g. (d) The adsorption ability of IDAA-PGMA/SiO₂ for rare earth ions is weaker than that for heavy metal ions. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Sulfonation of (glycidyl methacrylate) chains grafted onto nonwoven polypropylene fabric

Sulfonation of polyglycidyl methacrylate (PGMA) chains grafted onto nonwoven polypropylene fabric is investigated in detail. Sulfonation reaction consists in implantation of sulfonate groups via epoxy ring‐opening of PGMA chains grafted onto nonwoven polypropylene fabric by reaction between the GMA‐grafted sample and sodium hydrogensulfite in water–dimethylformamide solution. On the basis of analyses of IR spectra of the appropriate samples and data of backward titration, two simultaneous processes are demonstrated to take place during the sulfonation reaction. These processes are the implantation of sulfonate groups via opening of the GMA epoxy rings and hydrolysis of the GMA epoxy rings with α‐glycol groups formation. The main peculiarities of the sulfonation reaction in depending on the GMA grafting degree are reported. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

氨基功能化聚苯乙烯纳米微球的制备及其CO2吸附性能研究

以苯乙烯(St)和甲基丙烯酸缩水甘油酯(GMA)为共聚单体,通过细乳液聚合法制备出聚苯乙烯纳米微球,并研究了单体配比与反应条件对纳米微球粒径大小与分布的影响。然后利用GMA上的活性环氧基团将有机胺接枝到纳米微球表面,并将其应用于CO2吸附。采用动态激光散射、扫描电子显微镜、红外光谱、元素分析等方法对纳米微球进行了结构表征。结果表明,所制备的纳米微球最小粒径为67 nm,粒径大小均一可控,而且纳米微球表面成功地接枝上有机胺;乙二胺改性纳米微球的CO2吸附量为2.45 mmol/g,并且吸附循环稳定性较好。     

Reconsideration on the mechanism of free-radical melt grafting of glycidyl methacrylate on polyolefin

The styrene (St) assisted melt grafting of glycidyl methacrylate (GMA) on polyolefin was carried out by Haake mixer, and the grafting mechanism was investigated and reconsidered. It was revealed that there is equilibrium of grafting of GMA and depolymerization of grafted PGMA chains in the GMA/polyolefin grafting process, which was affected by both of the temperature and GMA concentration. It was found that the depolymerization of PGMA grafted on polyolefin occurred at the temperature above ceiling temperature of PGMA and dominated the grafting process before the addition of styrene monomer, which induced the decrease in grafting ratio of GMA. Adding styrene as co-monomer could promote the equilibrium moving forward to form the St-GMA chains so that the grafting ratio was greatly improved. It is proved that either controlling the reacting temperature below the ceiling temperature or changing the feeding order of styrene and GMA is effective to attain high grafting ratio of GMA on polyolefin.     

PGMA／Al2O3填充环氧树脂灌封材料性能的研究

采用“Grafting from”的方法,制备了接枝微粒聚甲基丙烯酸缩水甘油酯／Al2O3（PGMA／Al2O3）。研究了PGMA/Al2O3及固化剂用量对环氧灌封材料的性能影响。利用扫描电镜观察了PGMA/Al2O3填充的环氧灌封材料的冲击断面的形貌。结果表明,对氧化铝粒子进行接枝改性后,复合粒子在环氧树脂灌封中得到良好的分散、增韧效果明显优于未改性的Al2O3,且在用量较少时就可明显提高环氧灌封材料的冲击强度。     

Preparation of magnetic poly(glycidyl methacrylate) microspheres by emulsion polymerization in the presence of sterically stabilized iron oxide nanoparticles

With the aim to synthesize water‐dispersible superparamagnetic nanoparticles, iron oxide was precipitated in aqueous solution of dextran, (carboxymethyl) dextran (CM‐dextran), (DEAE‐dextran), or D ‐mannose. Glycidyl methacrylate (GMA) was emulsion‐polymerized in the presence of the nanoparticles and the effect of iron oxide modification on the product properties was investigated. The main factors affecting the morphology, size, and size distribution of the latex particles are the type and concentration of emulsifier (Disponil AES 60, Tween 20, Triton X‐100) and initiator [ammonium persulfate (APS) and 4,4′‐azobis(4‐cyanovaleric acid) (ACVA)]. Disponil AES 60 and ACVA are the preferred emulsifier and initiator, respectively, because oxirane groups hydrolyzed during the APS‐initiated polymerization. Up to some 5 wt % of iron was found in poly(glycidyl methacrylate) (PGMA) microspheres obtained by emulsion polymerization in the presence of dextran‐coated iron oxide and emulsified with Disponil AES 60. The size of magnetic PGMA microspheres could be controlled in the range ? 70–400 nm. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4348–4357, 2006     

Grafting emulsion polymerization of glycidyl methacrylate onto leather by chemical initiation systems

The kinetics of the grafting polymerization of glycidyl methacrylate (GMA) onto leather were studied with chemical initiation systems. The results showed that the rate of grafting of GMA onto leather was dependent on different rates in the chemical initiation systems; for ammonium persulfate (AmPS)/acetone sodium bisulfite (ASBS), potassium persulfate (PPS)/ASBS, and sodium persulfate (SPS)/ASBS, the powers were 1.06, 0.48, and 0.43 and 0.63, 0.46, and 0.43, respectively, with respect to the concentration of the emulsifier sodium dodecyl sulfate, whereas the powers were 1.41, 0.70, and 0.81, respectively, with respect to the monomer concentration. The apparent activation energy was calculated for each initiation system and was found to be 180.8, 361.63, and 542.45 kcal for the AmPS/ASBS, PPS/ASBS, and SPS/ASBS systems, respectively. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Studies on preparation of PGMA/Al2O3 and its effect on impact strength of epoxy resin

In this article, two kinds of methods for grafting polyglycidyl methacrylate (PGMA) onto Al₂O₃ surface by the radical polymerization initiated by peroxide groups and double bond groups, respectively, were investigated. In the first method, peroxide groups, as initiators, were immobilized onto the Al₂O₃ surface. Then, GMA was polymerized on Al₂O₃ under the radicals decomposed by peroxide groups, and PGMA was grafted onto Al₂O₃. But in the second method, 3‐methacryloylpropyl trimethoxysilane was chemically bonded onto the Al₂O₃ surfaces firstly to introduce double bonds. Secondly, the copolymerizations between the immobilized double bonds and the monomer GMA were performed, homopolymerizations of GMA followed, and finally PGMA was grafted to the Al₂O₃ surfaces. The effects of grafting methods on grafting degree were examined mainly. At the same time, the effects of different grafting conditions on the grafting degree were researched. Furthermore, the effect of the grafted particles PGMA/Al₂O₃ on impact strength of the epoxy composites was studied. It was found that the grafting degree achieved by the first method was much higher than that by the second, and the grafting degree can reach about 54%. Moreover, the impact strength of epoxy composites containing PGMA/Al₂O₃ particles were improved largely, and which increased with the grafting degree. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009