共查询到20条相似文献,搜索用时 84 毫秒
1.
在合成N-[4-(磺酰胺)苯基]丙烯酰胺(ASPAA)单体,并进行结构表征的基础上,以N,N-二甲基甲酰胺为溶剂,过氧化苯甲酰为引发剂,采用自由基溶液聚合合成了ASPAA/甲基丙烯酸甲酯/丙烯腈三元共聚物,用IR和^1H—NMR图谱确认了结构。共聚结果表明85℃和95℃,引发剂浓度1.0%~1.5%时,聚合初期速率较高;共聚物分子量随聚合温度和引发剂浓度增加而降低。随ASPAA含量的增加,共聚物的玻璃化温度和酸值均升高,并通过ASPAA含量来调节。 相似文献
2.
3.
CR/CPVC/MMA三元接枝共聚物 总被引:8,自引:0,他引:8
研究了高氯含量的氯化聚氯乙烯(CPVC)对氯丁橡胶/甲基丙烯酸甲酯接枝共聚合的影响,用红外光谱法和差热分析法对改性粘合剂进行了表征,结果表明,使用CPVC不仅明显提高粘合剂PVC材料的粘接强,而且还降低了成本。 相似文献
4.
5.
6.
N-对甲苯基马来酰亚胺乳液共聚物性能表征 总被引:3,自引:0,他引:3
通过乳液聚合制得N-对甲苯基马来酰亚胺(NPTMI)、甲基丙烯酸甲酯、苯乙烯的三元共聚物.采用热重分析、维卡软化点测试、差示扫描量热分析等方法研究了不同单体配比共聚物的热性能及力学性能.用凝胶渗透色谱(GPC)测定了共聚物的分子量及其分布。结果表明:加入NPTMI可以有效地提高共聚物的热稳定性,NPTMI质量分数为20%的共聚物与不含NPTMI的共聚物相比.玻璃化转变温度、维卡软化点、热分解起始温度、分解50%时的温度分别提高了22.6,19.5,42.8,46.2℃.但力学性能有所下降。GPC测定结果表明,分子量在合适的单体配比下出现最大值。 相似文献
7.
8.
9.
10.
以甲基丙烯酸甲酯(MMA)、苯乙烯(St)、丙烯酸异辛酯(EHA)作为乳液聚合单体,过硫酸铵(APS)作为引发剂,十二烷基硫醇作为链转移剂合成了高固含稳定的水性油墨丙烯酸乳液。研究了MMA与St的不同质量比(1∶0、7∶3、1∶1、4∶6、0∶1)对乳液性能(耐乙醇稳定性、复溶性、附着力)的影响。结果表明,MMA与St的不同配比对乳液耐乙醇稳定性、复溶性、附着力都有不同程度的影响。当MMA与St的质量比为7∶3时,乳液耐乙醇稳定性强,复溶性好,更重要的是在PE膜上的附着力可达100%,在PP膜上的附着力可达85%。总体结果显示,该乳液在水性油墨中具有很大的应用潜力。 相似文献
11.
12.
13.
14.
15.
16.
17.
J. ChudejI. Capek 《Polymer》2002,43(5):1681-1690
Batch emulsion polymerization of styrene initiated by an oil-soluble initiator and stabilized by non-ionic emulsifier (Tween 20) has been investigated. The rate of polymerization vs. conversion curve shows the two non-stationary rate intervals typical for the non-stationary-state polymerization. This behavior is a result of the continuous particle nucleation and the decrease of monomer concentration at the reaction loci with increasing conversion. The initial increase of the polymerization rate is attributed to the increase of particle number and the polymerization proceeding under the monomer-saturated condition—the Winsor I-like (micro)emulsion polymerization. The decrease of the polymerization rate is the result of the depressed transfer of monomer from the monomer reservoir to the reaction loci. Above 50 °C the monomer emulsion separates into two phases: the upper transparent monomer phase and the lower blue colored (microemulsion) phase. The polymerization mixture consists of the microdroplets (act as the reaction loci) and large degradable monomer droplets (act as the reservoir monomer and emulsifier). The continuous release of emulsifier from the monomer phase and the microdroplets induce the continuous particle nucleation up to high conversion. The initial formation of large particles results from the agglomeration of unstable growing particles and monomer droplets. The size of large (highly monomer-swollen) particles decreases with conversion and they merge with the growing particles at ca. 40-50% conversion. The coarse initial emulsion transformed during polymerization to the fine (semitransparent) polymer emulsion as a result of the continuous particle nucleation, the shrinking of highly monomer-swollen polymer particles and the depletion of monomer droplets. The low overall activation energy of polymerization is mainly ascribed to the decreased barrier for entering radicals into the latex particles with increasing temperature. 相似文献
18.
丙烯酸酯-苯乙烯共聚物高吸油树脂的合成与性能 总被引:9,自引:1,他引:9
以甲基丙烯酸酯和苯乙烯为单体,丙烯酸乙二醇酯为交联剂,采用悬浮聚合法合成了高吸油树脂;研究了共聚单体组成,交联剂用量对吸油树脂吸油性能及吸油后树脂强度的影响。结果表明。所制成的树脂可吸自重21倍以上的煤油.25倍以上的苯、二甲苯,且吸油后树脂强度高。 相似文献
19.
研究了4,4'-偶氮二[4-氰基戊酰(对-二甲基氨基)苯胺](ACPDA)/过氧化二苯甲酰(BPO)氧化还原引发体系在N,N-二甲基甲酰胺(DMF)中引发苯乙烯(St)的聚合及其动力学行为.考察了聚合反应温度、单体浓度、ACPDA浓度和BPO浓度对聚合物分子量和聚合反应速率的影响,测定了反应级数和聚合反应的活化能.实验结果表明:在一定范围内,聚合反应速率随单体浓度、ACPDA浓度、BPO浓度的增加和反应温度的升高而加快;聚合物分子量随单体浓度的增大而增大,随ACPDA浓度、BPO浓度的增大和反应温度的升高而降低.该体系具有氧化还原引发体系的特点,其聚合速率方程为Rp=K[St]1.52[ACPDA]0.56[BPO]0.49,聚合反应的表观活化能Ea =35.43 kJ/mol. 相似文献