共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
梳形抗盐聚合物的应用与研究进展 总被引:2,自引:0,他引:2
梳形抗盐聚合物KYPAM在大庆、胜利和华北油田的聚合物驱、三元复合驱和深部调驱现场应用中已取得很好的效果 ,各油田正在加大推广应用范围。进一步改进梳形抗盐聚合物的结构研究取得重大进展 ,增稠能力大幅度提高 ,进一步验证了梳形聚合物分子设计理论。 相似文献
3.
4.
以马来酸酐、聚乙二醇单甲醚(m PEG1200)、2,2,6,6-四甲基哌啶醇(TMP)为原料,合成了中间体富马酸2,2,6,6-四甲基哌啶醇聚乙二醇单甲醚双酯(TMP-MF-m PEG1200)。然后在N2保护下以2-羟基-4-丙烯酸酯基二苯甲酮(HABP)、TMP-MF-m PEG1200、苯乙烯为原料,甲苯为溶剂,过氧化二苯甲酰(BPO)为引发剂,通过溶液共聚合成了一系列不同HABP含量的复合型高分子光稳定剂P(HABP-co-TMP-MF-m PEG1200-co-St)。采用红外光谱(IR)、紫外光谱(UV)、核磁共振(1H NMR)等手段对TMP-MF-m PEG1200和P(HABP-co-TMP-MFm PEG1200-co-St)进行了结构表征。考察了不同HABP含量梳状复合型高分子光稳定剂的紫外光吸收效果。结果表明,P(HABP-co-TMP-MF-m PEG1200-co-St)在250~350 nm范围内有良好的紫外吸收,随着HABP含量的增加,其紫外光吸收强度增强。进行了HABP与共聚产物的热重分析,结果表明共聚产物的热稳定性明显提高。 相似文献
5.
以甲基丙烯酸(MAA)和聚乙二醇单甲醚(MPEG)为主要原料,通过酯化反应制备聚乙二醇单甲醚甲基丙烯酸酯(1330)。研究了催化剂及其用量,阻聚剂用量,n(MAA):n(MPEG),酯化反应时间和酯化温度对酯化反应的影响,得到了最佳酯化条件:n(MAA):n(MPEG)=1.6:1,负载磺酸型催化剂用量2.5%,阻聚剂用量250×10~(-6),酯化温度11 5~120℃,反应回流5.5h。结果表明,在该条件下合成的聚乙二醇单甲醚甲基丙烯酸酯酯化率较高,在97.5%以上。 相似文献
6.
7.
8.
9.
二醋酸纤维素与聚乙二醇单甲醚接枝共聚物的合成与表征 总被引:4,自引:0,他引:4
采用聚乙二醇单甲醚 (MPEG)作为改性剂 ,与二醋酸纤维素 (CDA)进行接枝反应。用正交实验法研究了聚乙二醇的分子量、二醋酸纤维素与聚乙二醇的配比、2 ,4-甲苯二异氰酸酯的用量、催化剂的用量和反应时间对接枝反应的影响 ,确定了最佳的配方和工艺。对相应的接枝共聚物进行了FTIR ,DSC ,1 HNMR和1 3CNMR的表征分析。结果表明 :在1 5 38cm- 1 出现酰胺Ⅱ带氨基甲酸酯的吸收峰 ,在 1 60 4cm- 1 出现芳香环的吸收峰 ;从DSC分析可知 ,由于MPEG被固定后 ,链段运动自由度受到限制 ;用1 HNMR和1 3CNMR核磁共振技术研究了二醋酸纤维素和聚乙二醇的接枝共聚物 ,并确定了1 HNMR和1 3CNMR谱中各谱峰的归属 ,证明了MPEG是通过化学键连接到CDA上 相似文献
10.
11.
以β-丁内酯(BL)为单体、萘钾-冠醚为引发剂通过阴离子开环聚合合成聚(β-丁内酯)(PHB),研究了反应时间对PHB分子量的影响。在萘钾-冠醚引发体系的基础上制备聚乙二醇甲醚-钾大分子引发剂(mPEG-K),采用mPEGK引发β-丁内酯开环聚合合成两亲性嵌段共聚物聚乙二醇甲醚-聚(β-丁内酯)(mPEG-PHB),并通过1 HNMR、FTIR、DSC对其进行表征。通过分子自组装技术制备了mPEG-PHB共聚物的纳米粒子,采用SEM、TEM、DLS对纳米粒子进行表征。结果表明,在一定时间内PHB的分子量随反应时间的延长而增大。DSC结果表明,无定形的PHB明显降低了结晶性mPEG的结晶能力。mPEG-PHB纳米粒子为粒径在100nm左右的具有核壳结构的纳米微球。 相似文献
12.
利用直接缩聚法制备了乳酸与聚乙二醇的嵌段共聚物(PLEG)。采用正交试验法考察了乳酸与聚乙二醇质量比、催化剂种类、催化剂含量、反应温度和反应时间对PLEG性能的影响。结果显示优化的反应条件:乳酸与聚乙二醇质量比为8.5∶1.5,采用自制的复合催化剂,催化剂质量分数0.6%,聚合温度160℃,聚合时间5h。另外还考察了扩链剂对PLEG性能的影响,结果表明扩链剂能够显著提高PLEG的相对分子质量。对合成的PLEG通过红外光谱、核磁共振、热分析进行了表征。 相似文献
13.
14.
Macrophotoinitiators based on poly(ethylene glycol)s bearing benzyl tereftalmono amid moieties were synthesized by the reaction of poly(ethylene glycol) (PEG) terminated with terephtaloyl chloride and benzyl amine. The initiators possessing PEG with different molecular weights were used in the photoinduced radical polymerization of styrene (S) and methyl methacrylate (MMA) to yield poly(styrene-b-ethylene glycol-b-styrene) and poly(methyl methacrylate-ethylene glycol-b-methyl methacrylate) triblock copolymers. Characterization of macrophotoinitiators were performed by elemental anlysis, IR and 1H-NMR spectrum. The elemental analysis results agreed with the theoretical values. The IR and 1H-NMR spectra showed that the poly(ethylene glycol) units were reacting with the tereftloyl chloride and benzylamine. Characterization of the block copolymers was carried out by spectral measurements, GPC and fractional precipitation methods. The polydispersities of the block copolymers were observed between 1.2–2.32 for poly(methyl methacrylate-ethylene glycol-b-methyl methacrylate) and 1.25–1.90 for poly(styrene-b-ethylene glycol-b-styrene) from GPC measurements. 相似文献
15.
聚乙二醇/聚己内酯三嵌段共聚物的合成与表征 总被引:3,自引:0,他引:3
以甲苯二异氰酸酯 (TDI)为偶联剂 ,合成了聚乙二醇 (PEG) /聚己内酯 (PCL)两亲性三嵌段共聚物 (PEG-b-PCL -b -PEG ,PECL) ,采用IR、1 H-NMR、DSC和WAXD分析和研究了PECL的结构与性能。实验结果表明 ,PECL的结构和组成与设计相一致 ,结晶度和熔点均低于均聚物 ,且随着PECL中PCL嵌段含量的增加 ,PCL嵌段熔点升高。透射电镜照片显示PECL纳米粒呈核 /壳结构的球形。 相似文献
16.
以mPEG-Br为大分子引发剂,CuBr/PMDETA为催化体系,采用原子转移自由基聚合法(ATRP)合成了两亲性嵌段共聚物聚乙二醇-聚丙烯酸叔丁酯(mPEG-b-PtBA),并采用FT-IR,1H-NMR和GPC等表征了聚合物的结构.考察了单体与引发剂的配比、反应时间、反应温度及催化剂与配体的比例等因素对产物的分子量... 相似文献
17.
Ioanna Tzoumani Amaia Soto Beobide Zacharoula Iatridi George A. Voyiatzis Georgios Bokias Joannis K. Kallitsis 《International journal of molecular sciences》2022,23(15)
Self-healing materials and self-healing mechanisms are two topics that have attracted huge scientific interest in recent decades. Macromolecular chemistry can provide appropriately tailored functional polymers with desired healing properties. Herein, we report the incorporation of glycidyl methacrylate-based (GMA) copolymers in waterborne polyurethanes (WPUs) and the study of their potential healing ability. Two types of copolymers were synthesized, namely the hydrophobic P(BA-co-GMAy) copolymers of GMA with n-butyl acrylate (BA) and the amphiphilic copolymers P(PEGMA-co-GMAy) of GMA with a poly(ethylene glycol) methyl ether methacrylate (PEGMA) macromonomer. We demonstrate that the blending of these types of copolymers with two WPUs leads to homogenous composites. While the addition of P(BA-co-GMAy) in the WPUs leads to amorphous materials, the addition of P(PEGMA-co-GMAy) copolymers leads to hybrid composite systems varying from amorphous to semi-crystalline, depending on copolymer or blend composition. The healing efficiency of these copolymers was explored upon application of two external triggers (addition of water or heating). Promising healing results were exhibited by the final composites when water was used as a healing trigger. 相似文献
18.
19.
Several polystyrene-poly(ethylene oxide)-polystyrene (PS-PEO-PS) and poly(methyl methacrylate)-polystyrene-poly(methyl methacrylate) (PMMA-PS-PMMA) block copolymers, synthesized by free-radical polymerization, were studied in various solvents by using a light-scattering technique. The copolymers, which have different lengths of central blocks, had molecular weights within the range 3.0 × 104 to 1.6 × 106. It was found that almost all of them were confirmed as block copolymers from the variation of the product with , although they were rather heterogeneous. The copolymer compositions determined either from the additivity of the refractive index increments of its constituent parts and the copolymer or from ultra-violet analysis were in excellent agreement with each other. 相似文献
20.
郭丽春;任亮;李明远;刘毅梅;张明耀;张会轩 《中国塑料》2012,26(1):18-22
采用乳液聚合法在聚丁二烯(PB)乳胶粒子上接枝苯乙烯(St)和甲基丙烯酸甲酯(MMA),合成了一系列的MBS接枝共聚物(简称MBS),将其与聚甲基丙烯酸甲酯(PMMA)进行熔融共混制备PMMA/MBS共混物,研究了PB及相对分子质量调节剂叔十二烷基硫醇(TDDM)含量对共混物力学性能和微观形态结构的影响。结果表明,随着MBS中PB所占比例的增加,共混物的冲击强度表现出先增大后减小的趋势,当PB所占比例为50 %(质量分数,下同)时,共混物的冲击强度达到200 J/m,而拉伸强度表现出上升的趋势;随着TDDM用量的增加,MBS的接枝率和接枝效率降低,导致共混物的冲击强度先增加后减小;随着MBS中PB所占比例的增加,接枝率的逐渐降低,MBS在PMMA基体中分散程度逐渐变差。 相似文献