甲基丙烯酸锌在NBR中的应用

研究了甲基丙烯酸锌[Zn(MAA)2]对硫黄和过氧化物硫化体系NBR的硫化特性,力学性能及耐热氧老化性能的影响。结果表明,Zn(MAA)2提高了NBR硫化胶的力学性能和耐热氧老化性能。对于硫黄硫化体系,Zn(MAA)2使正硫化延长;对于过氧化物硫化体系,则使之缩短,差示扫描量热分析表明,Zn(MAA)2在2种硫化体系中的硫化机理有所不同。     

甲基丙烯酸锌对EPDM的补强作用

研究了在过氧化物硫化体系中,甲基丙烯酸锌[Zn(MAA)2]和硫化剂DCP的用量对EPDM胶料性能的影响。试验结果表明,Zn(MAA)2用量的增大对EPDM胶料粘度的影响不大,但可显提高硫化速度和硫化程度;随着Zn(MAA)2用量的增大,EPDM硫化胶的邵尔A型硬度逐渐增大,拉伸强度和扯断伸长率都是先升高再下降。当硫化剂DCP用量为1．0份时,EPDM硫化胶具有最佳的综合性能。Zn(MAA)2的补强效果与EPDM的物理化学性质有关,乙烯质量分数和第三单体ENB质量分数高时补强效果好。     

添加剂对甲基丙烯酸镁补强NBR性能的影响

研究了各种常用橡胶添加剂对甲基丙烯酸镁[Mg(MAA)2]补强NBR力学性能的影响,考察了Mg(MAA)2与甲基丙烯酸锌[Zn(MAA)2]并用对NBR的补强作用。试验结果表明,炭黑、白炭黑和硕酸钙等常规补强剂可以与Mg(MAA)2并用补强NBR,其补强效果基本上符合加和定律;软化剂的加入可以降低Mg(MAA)2补强MBR硫化胶的硬度,同时提高扯断伸长率;Mg(MAA)2与Zn(MAA)2并用可以补强NBR。     

NBR/Zn(MAA)2/蒙脱土纳米复合材料的研究

研究NBR／基丙烯酸锌[Zn(MAA)2]／蒙脱土纳米复合材料的性能。结果表明，Zn(MAA)2可以通过原位聚合反应在与NBR发生接枝交联的同时，实现对蒙脱土的插层，用该方法制备的NBR／Zn(MAA)2／蒙脱土纳米复合材料的物理性能优异，含有有机改性蒙脱土HMMT和USM的复合材料性能更为突出，且具有一定的透明性。     

NBR/Zn(MAA)2合金的硫化与交联

用硫化仪研究了NBR/Zn(MAA)     

硫化体系对NBR/PCMO共混物性能的影响

研究不同硫化体系对NBR／氯化聚醚(PCMO)共混物性能的影响。试验结果表明，低硫高促硫化体系共混物硫化胶的耐热空气老化性能较好，复合硫化体系共混物硫化胶的压缩永久变形性能最佳；过氧化物硫化体系中硫化剂DCP用量为3．5份，甲基丙烯酸锌[Zn(MMA)2]／DCP硫化体系中Zn(MMA)2用量为10份、硫化剂DCP用量为     

Zn（MAA）_2添加方式对CM性能的影响

考察了甲基丙烯酸锌（Zn（MAA）2）添加方式对CM性能的影响。结果表明,Zn（MAA）2用量相同时,原位生成Zn（MAA）2的胶料力学性能优于直接添加Zn（MAA）2的胶料;随着Zn（MAA）2用量的增大,胶料硫化程度明显提高,力学性能得到明显改善,老化后的拉伸性能保持率也得到改善;Zn（MAA）2用量在30～40份之间时,拉伸强度可达到19.7MPa,撕裂强度提高3倍以上。     

甲基丙烯酸镁在油井钻具NBR密封胶中的应用

考察甲基丙烯酸镁的加人对丁腈橡胶(NBR)共混胶的基本物性、耐老化性能和与金属黏合性能的影响,试验结果显示:随Mg(MAA)2用量的增加,硫化胶综合性能总体呈上升趋势,在11～12份之间时与制品要求有最佳的符合值;Mg(MAA)2的加入对NBR与金属的黏合影响明显,用量为11份时有最高剥离强度;剥离试样断面相差显微镜照片分析显示,Mg(MAA)2/NBR与金属黏合附胶率优于传统增黏树脂/NBR共混胶.     

Mg(MAA)2对NBR与金属粘合和硫化性能的影响

考察了甲基丙烯酸镁[Mg（MAA）2]对丁膀橡胶（NBR）与金属粘合性能的影响，实验结果表明：随Mg（MAA）2用量的增加，硫化胶的伸长率、撕裂强度和硬度都一直呈上升趋势，而拉伸强度先下降后上升，Mg（MAA）2的加入对NBR与金属粘舍强度的提高有明显效果，用量为11份时强度最高；硫化过程出现双焦烧期现象，说明Mg（MAA）2在无过氧化物条件下即可引发。     

Zn(AA)2与Zn(MAA)2并用对EPDM硫化胶性能影响

本文研究了丙烯酸锌[Zn(AA)2]与甲基丙烯酸锌[Zn(MAA)2]并用对三元乙丙橡胶(EPDM)物理机械性能的影响。实验结果表明：Zn(AA）2与Zn(MAA)2并用对EPDM性能的影响不产生协同效应，Zn(AA)2对提高EPDM硫化胶物理力学性能和与金属的粘合强度比Zn(MAA)2有更显著的效果，Zn(AA)2的用量在4—5份时即可取得较好的粘合强度。     

高性能NBR／Zn（MAA）2合金的研究

将自制的甲基丙烯酸锌［（Ｚｎ（ＭＡＡ）２］与丁腈橡胶（ＮＢＲ）共混,采用就地反应法制得了高性能的ＮＢＲ／Ｚｎ（ＭＡＡ）２合金。结果表明,高Ｚｎ（ＭＡＡ）２用量的合金体系在较低过氧化二异丙苯用量下即可取得良好的综合力学性能;合金具有较好的耐热氧老化性能和热稳定性;动态粘度谱仪分析表明,合金体系中ＮＢＲ相的Ｔｇ向高温方向移动,说明Ｚｎ（ＭＡＡ）２与ＮＢＲ有较强的化学和物理作用。     

聚合物/锡锌合金复合材料的密炼混合行为

研究了Sn Zn合金组成、含量、密炼工艺、以及聚合物基体对制备Sn Zn合金/聚合物复合材料过程中金属析出量的影响。结果表明,当Sn Zn合金组成一定时,合金添加量较低时,合金析出量为零,当合金添加量较高时,合金析出量随Sn Zn合金添加量增大而增大;增加Sn Zn合金中Zn含量,可减弱金属析出;与纯锡相比,Sn Zn合金与高密度聚乙烯（PE HD）有更强的复合能力;升高加工温度与降低Sn Zn合金中Zn的比例对于抑制金属析出具有等效性;合金析出量随密炼转速增大而增加,但转速增大会减小合金粒径分布;Zn质量分数为30 wt%的合金与PE HD密炼的最佳时间为35 min;提高聚合物极性,可减弱聚合物与Sn Zn合金复合时发生的金属析出。     

pH and temperature responsive porous membranes via an in situ bulk copolymerization approach

In the present study, an in situ approach to pH and temperature responsive membranes is developed. The membrane matrix is formed through bulk polymerization and crosslinking of liquid monomer 2-hydroxyethyl methacrylate (HEMA) while the membrane pores are formed by the templating of inorganic particles. The functional monomers methacrylic acid (MAA) and N-isopropylacrylamide (NIPAAm) are incorporated into membrane casting solution in order to confer membranes with pH and temperature responsive properties. The poly(HEMA/MAA) membranes exhibit a reversible pH-dependent water flux, while the poly(HEMA/NIPAAm) membranes exhibit a reversible temperature-dependent water flux. The flux of the poly(HEMA/MAA) membrane increased by 70% when pH was decreased from 10.0 to 2.0, while the flux poly(HEMA/NIPAAm) membrane increased by 150% when temperature was increased from 20 to 45 °C. The protein adsorption and antifouling performance of the poly(HEMA/MAA) and poly(HEMA/NIPAAm) membranes also exhibit pH and temperature responsive properties.     

Synthesis and characterization of poly(HEMA‐MAA) hydrogel carrier for oral delivery of insulin

Poly(HEMA‐MAA) hydrogel particles were synthesized by redox free‐radical polymerization using 2‐hydroxyethylmethacrylate, different concentration of methacrylic acid as monomer, ethyleneglycol dimethacrylate as crosslinking agent, and APS/TEMED as free‐radical initiator. Fourier transform infrared spectrum of poly(HEMA‐MAA) hydrogels showed intense absorption peak of carbonyl group at ～ 1700 cm^?1 due to carboxylic acid groups of MAA, peak at ～ 2960 cm^?1 due to CH stretching and vinylic peak at 1700 cm^?1 independent of MAA concentration. Highest swelling percentage 587% was observed in case of poly(HEMA‐MAA) hydrogel synthesized using 30% of MAA while lowest swelling percentage 413% was observed in hydrogel synthesized 10% of MAA at basic pH (8.0). Scanning electron micrograph of copolymeric particles showed the irregular shape of poly(HEMA‐MAA) particles with conglomeration with each due to ionization of carboxylic groups. Insulin was radiolabeled using technetium‐99m radionuclide and the radiolabeling efficiency was found to be 99%. Poly(HEMA‐MAA) hydrogel having 60% of MAA showed the highest insulin loading efficiency of 68% while lowest 37% was observed in case of 10% MAA hydrogel. Insulin release studies showed only 35–65% of insulin was released into the medium from particles at pH 2.5 in 60 min, while insulin release was significantly higher at pH 7.4. Hypoglycemic effect of the 60 and 80 I.U./kg insulin dose loaded in poly(HEMA‐MAA) copolymeric particles were carried out in fasted diabetic rats and highest decrease in blood glucose level from 506 mg/dL to 170 mg/dL was observed within first 3 h. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.     

MAA原位改性纳米碳酸钙对SBR胶料性能的影响

试验研究甲基丙烯酸（MAA）原位改性纳米碳酸钙对SBR胶料性能的影响。结果表明,在纳米碳酸钙填充SBR胶料中加入MAA,胶料的硫化特性变化不大,硫化胶的物理性能明显提高；随着MAA用量的增大,SBR硫化胶的离子交联密度逐渐增大。扫描电镜分析表明,MAA的加入增强了纳米碳酸钙与SBR基体之间的相互作用。     

pH‐responsive hydrogel microparticles as intelligent delivery carriers for α‐MSH antagonists

For a first step in the development of an intelligent delivery system for a nonapeptide as an α‐MSH antagonist, pH‐responsive P(MAA‐co‐EGMA) hydrogel microparticles were prepared and their feasibility as intelligent delivery carriers was evaluated. There was a drastic change in the swelling ratio of P(MAA‐co‐EGMA) microparticles at a pH of around 5 and as the MAA amount in the hydrogel increased, the swelling ratio increased at a pH above 5. The loading efficiency of the nonapeptide at pH 7 increased with the amount of Methacrylic acid (MAA) in the hydrogel and at pH 2, where the electrostatic attraction was greatest, a high loading efficiency was not obtained because of the low swelling ratio of the hydrogel. The P(MAA‐co‐EGMA) microparticles demonstrated a pH‐sensitive release behavior for the nonapeptide. In addition, the P(MAA‐co‐EGMA) microparticles showed a protective ability for the nonapeptide and preserved the stability of the nonapeptide. © 2010 American Institute of Chemical Engineers AIChE J, 2010     

聚乙烯熔融挤出接枝α—甲基丙烯酸

通过聚乙烯熔啧挤出接枝甲基丙烯酸（MAA）,研究了各种因素对LDPE接枝率及熔体流动速率的影响,研究表明,MAA用量对接枝率影响较大,而引发剂用量对接枝率影响不大;丙烯酸（AA）的加入提高了接枝率和熔体流动速率,而另入马来酸酐（MAH）接枝率则反而下降;DCP／BOP为4／1时接枝率最高,阻交联剂的加入提高了熔体流动速率,但降低了接枝率。