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排序方式: 共有561条查询结果,搜索用时 10 毫秒
1.
本文选择了过氧化异丙苯、过氧化苯甲酰、二叔丁基过氧化物三种引发剂进行实验。比较了三种引发剂的基本性能。讨论了引发剂种类及用量对接枝反应的影响,并研究了三种引发剂对PP降解及对接枝物外观颜色的影响。 相似文献
2.
Argon plasma-pretreated polyimide (PI, Kapton® HN) films were subjected to UV-induced surface graft copolymerization with N,N′-(dimethylamino)ethyl methacrylate (DMAEMA) and 2-(trimethylammonium)ethyl methacrylate chloride (TMMAC). The DMAEMA graft-copolymerized PI (DMAEMA-g-PI) surfaces were also quaternized and amino-functionalized with 3-bromopropylamine hydrobromide (the Q-DMAEMA-g-PI surfaces). The surface composition and the degree of quaternization of the graft-modified PI films were determined by X-ray photoelectron spectroscopy. The DMAEMA-g-PI, Q-DMAEMA-g-PI and TMMAC graft-copolymerized PI (TMMAC-g-PI) surfaces can be activated directly by PdCl2, in the absence of prior sensitization by SnCl2 (the ‘Sn-free’ activation process), for the subsequent electroless plating of copper. A shorter induction time for the electroless deposition of copper was found for the palladium-activated Q-DMAEMA-g-PI and TMMAC-g-PI surfaces than for the palladium-activated DMAEMA-g-PI surface. The T-peel adhesion strength of the electrolessly deposited copper with the Q-DMAEMA-g-PI surface was enhanced to above 6 N/cm, in comparison to only about 4 N/cm for the DMAEMA-g-PI surface, about 2.5 N/cm for the TMMAC-g-PI surface, or about 0.5 N/cm for the PI surface with argon plasma treatment alone. 相似文献
3.
CR/MMA乳液接枝共聚物的研制 总被引:1,自引:0,他引:1
用乳液接枝共聚法制备CR/MMA共聚物,讨论CR乳液、引发剂、接枝温度、MMA用量对接枝共聚转化率,接枝MMA含量、MMA接枝效率和粘接性能的影响,用红外光谱对接枝共聚物进行表征,该共聚物具有较好的粘接性能。 相似文献
4.
本文研究了γ-流基丙基三甲氧基硅烷(KH590)对白炭黑填充的SBR胶料的光接枝反应。通过接枝反应,提高了橡胶填料间界面粘合性,也提高了硫化胶的300%定伸模量,改善了撕裂强度、压缩永久变形及耐磨耗性等、此外,在NBR中也取得同样改性效果。尤其是,改善了耐碱性。但经照射后在室内放置会增加凝胶化,影响到加工性能. 相似文献
5.
6.
聚丙烯接枝改性及其接枝物的应用 总被引:1,自引:0,他引:1
对聚丙烯接枝的几种方法、单体和引发剂的选择及接枝物的表征作了简要的介绍;并介绍聚丙烯接枝物的应用情况。 相似文献
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8.
The synthesis of magnetite nanoparticles coated with a well-defined graft polymer is reported. The magnetite nanoparticles with an initiator group for copper-mediated atom transfer radical polymerization (ATRP), 2-(4-chlorosulfonylphenyl) ethyltrichlorosilane (CTCS) chemically bound on their surfaces were prepared by the self-assembled monolayer-deposition method. The surface-initiated ATRP of methyl methacrylate (MMA) was carried out with the CTCS-coated magnetite nanoparticles in the presence of free (sacrificing) initiator, p-toluenesulfonyl chloride. Polymerization proceeded in a living fashion, exhibiting first-order kinetics of monomer consumption and a proportional relationship between molecular weight of the graft polymer and monomer conversion, thus providing well-defined, low-polydispersity graft polymers with an approximate graft density of 0.7 chains/nm2. The molecular weight and polydispersity of the graft polymer were nearly equal to those of the free polymer produced in the solution, meaning that the free polymer is a good measure of the characteristics of the graft polymer. The graft polymer possessed exceptionally high stability and remarkably improved dispersibility of the magnetite nanoparticles in organic solvent. 相似文献
9.
Xiaohuan Zhang 《Polymer》2007,48(19):5507-5513
A series of well-defined graft copolymers with a polyallene-based backbone and poly(methyl methacrylate) side chains were synthesized by the combination of living coordination polymerization of 6-methyl-1,2-heptadien-4-ol and atom transfer radical polymerization of methyl methacrylate. We first prepared poly(alcohol) with polyallene repeating units via 6-methyl-1,2-heptadien-4-ol by living coordination polymerization initiated by [(η3-allyl)NiOCOCF3]2, followed by transforming the pendant hydroxyl groups into halogen-containing ATRP initiation groups. Next, grafting-from route was used for the synthesis of the well-defined graft copolymer with excellent solubility: poly(methyl methacrylate) was grafted to the backbone via ATRP of methyl methacrylate. This kind of graft copolymer is the first example of graft copolymer via allene derivative and methacrylic monomer. 相似文献
10.
Novel self-curable cathodically depositable coatings were developed from glycidyl functional epoxy ester-acrylic graft co-polymer (EEAG) without using any external crosslinking agents. The EEAG-amine adducts (EEAGAs) were prepared by reacting EEAG with varying amount of diethanolamine (DEoA) which are neutralized with acid and dispersed in deionised water to give stable dispersion for cathodic electrodeposition (CED) coatings. The dispersions were cathodically electrodeposited on phosphated steel panels and thermally cured to give uniform coating. The coatings were evaluated for different mechanical, chemical and corrosion resistance properties. The coatings were evaluated for their thermal properties using thermo gravimetric analysis (TGA). The final properties of the coatings were found to be affected by the amount of amine reacted with epoxy. The coating films showed good overall performance properties for their use in coating industry. 相似文献