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graft copolymerization是什么意思,graft copolymerization的意思翻译、用法、同义词、例句

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  • [高分子] 接枝共聚

  • 例句

  • Chemical modification including oxygenation, esterify, graft copolymerization and so on.

    化学改性主要有氧化、交联、酯化和接枝共聚。

  • The mechanism of graft copolymerization of casein and silk protein and the structure and properties of the graft copolymer, especially initiators and graft monomers, are reviewed.

    文章从引发体系、接枝单体两个方面综述了酪蛋白和丝素蛋白的接枝共聚改性机理以及接枝产物的结构和性能。

  • In this article, several methods about modification of chitosan both here and abroad were introduced as well as graft copolymerization.

    本文介绍了近年来国内外对壳聚糖改性的多种方法,以及接枝共聚;

  • The effects of esterification and graft copolymerization on surface free energy of wood were analyzed.

    确定了木材的酯化和接枝共聚改性对木材表面自由能变化的影响因素。

  • A novel method, in-situ chlorinating graft copolymerization (ISCGC), was employed to synthesize grafting copolymers of chlorinated polymers.

    氯化原位接枝法是制备氯化聚合物的接枝共聚物的一种新方法。

  • The effect of the esterification on contact angle is obviously bigger than that of graft copolymerization.

    酯化处理所产生的接触角增大作用要比接枝共聚所产生的作用大;

  • The graft copolymerization of acrylonitrile onto cotton yarn and viscose rayon with ceric. ammonium nitrate as initiator has been stu***d.

    以棉纱和粘胶丝为试料,研究了利用*********铈为引发剂的纤维素与*********的接枝共聚。

  • The synthesis of high water absorption resin with starch- acrylic acid graft copolymerization is explored.

    本文主要探索淀粉-*********接枝共聚反应合成高吸水性树脂。

  • IR analysis shows that graft copolymerization takes place on the tertiary carbon atom of PP molecular chain.

    红外光谱分析表明,************酸单体在聚丙烯大分子链的叔碳原子上发生接枝共聚。

  • So, the chemical modification which is carboxylic acid monomer graft copolymerization and adding in some functional monomers to prepare waterborne epoxy resin was carried out.

    因此,我们采用羧基单体接枝共聚并加入功能单体的方法对环氧树脂进行水性化的化学改性。

  • The graft copolymerization of vinyl monomers onto starch was an important method for the modification of starch.

    淀粉与*********单体接枝共聚是淀粉改性的重要方法。

  • The regularity of graft copolymerization of acrylamide onto corn starch by H_2O_2-TU initiation system was investigated.

    以H_2O_2-硫脲(TU)氧化还原引发体系,研究了************与玉米淀粉的接枝共聚反应规律。

  • The interactions between hydroxypropyl methylcellulose (HPMC) and potassium persulfate (KPS) during the emulsion graft copolymerization process in aqueous system were investigated.

    研究了乳液接枝共聚合,单体未加入体系前羟丙*********纤维素(HPMC)与引发剂************(KPS)的相互作用。

  • The general methods of graft copolymerization of chitosan, the properties and the applications of its graft copolymers have been reviewed briefly in this paper.

    综述了近年来壳聚糖接枝共聚反应的主要类型、聚合物的性能及其应用、开发前景。

  • The copolymers were formed by the graft copolymerization of PVC with acrylic rare earth.

    将无机稀土有机化后与聚*********(PVC)进行接枝共聚。

  • Graft copolymerization of acrylic acid onto tapioca by using persulphate as initiator was described.

    用过硫酸盐(过硫酸纳、钾或胺盐)氧化法使木薯淀粉与*********接枝共聚。

  • Enhancing char yield of ABS and SBS via graft copolymerization is one of the effective approaches to improve the flame retardancy of polymers.

    通过接枝共聚提高高聚物的成炭率,是改善材料阻燃性的有效技术措施。

  • This paper describes graft copolymerization of acrylic acid onto superfine cellulose using potassium persulphate as initiator.

    用过硫酸盐氧化法使超细纤维素与*********接枝共聚。

  • The graft copolymerization of methyl methacrylate (MMA) onto cyanoethylated crosslinked starch was carried out using APS-TU and APS-U as initiation system.

    以APS-TU和APS-U为引发体系,研究了*********化交联淀粉与************酸甲酯(MMA)的接枝共聚反应规律;

  • A stable emulsion could be prepared by graft copolymerization of starch gelatinized and oxidized with styrene in presence of initiator.

    在引发剂引发下,经糊化氧化处理后的淀粉和*********接枝共聚可制得稳定的乳液。

  • The graft copolymerization of binary mixture of styrene-Acrylamide onto bagasse cellulose pulp was investin-gated by using the cellulose xanthogenate Hydrogen peroxide redox system as an initiator.

    采用纤维素黄原酸酯-*********氢氧化还原体系为引发剂,将*********-丙烯酰胺混合单体与蔗渣纤维浆泊进行接枝共聚。

  • Synthesis on the graft copolymerization of carboxymethylcellulose(CMC) with acrylamide(AM) has been stu***d in this paper.

    研究了羧甲基纤维素-************接枝共聚反应。

  • Effeets of monomer concentration and reaction time on the graft copolymerization were stu***d.

    考察了单体浓度、发剂浓度、合温度对接枝共聚反应的影响。

  • The graft copolymerization of butyl acrylate(BA)onto chloroprene rubber(CR) is carried out in methylbenzene-ethyl acetate solvent by using a new type of efficient initiator.

    以一种新型的高效引发剂,在甲苯-************混合溶剂中进行氯丁橡胶(CR)与*********丁酯(BA)的接枝共聚反应。

  • 专业解析

    接枝共聚(graft copolymerization)是高分子化学中一种重要的聚合方法,指在现有聚合物主链上通过化学键连接不同种类的单体支链,形成具有"主链-支链"结构的共聚物。该技术由诺贝尔化学奖得主Paul J. Flory在1953年系统阐述其理论基础。

    从化学过程看,接枝共聚包含三个关键步骤:

    1. 主链活化:通过辐射、氧化或引发剂在聚合物主链生成活性位点
    2. 单体扩散:第二单体向活性位点迁移
    3. 支链生长:新单体在活性位点进行链式聚合,形成支链结构。反应遵循自由基聚合机理: $$ R· + M → RM· $$ $$ RM· + n M → RM_n· $$

    在工业应用中,接枝共聚显著改善材料性能。聚四氟乙烯(PTFE)经丙烯酸接枝后,表面粘结性提高20倍(《高分子材料改性技术》,化学工业出版社)。生物医学领域,壳聚糖接枝聚乳酸材料已用于药物缓释系统(Journal of Controlled Release, 2022)。

    该技术的核心参数包括接枝率(grafting percentage)和接枝效率(grafting efficiency),二者受单体浓度、引发剂类型和反应温度共同影响。美国材料试验协会(ASTM)制定了相关测试标准D7462-08。

    网络扩展资料

    graft copolymerization(接枝共聚)是一种高分子化学中的聚合反应,指通过化学键将一种或多种单体接枝到现有聚合物主链上,形成具有支链结构的共聚物。以下是详细解释:

    1. 基本定义
      该反应通常以现有聚合物为“主链”,通过引发剂或辐射等方式激活主链上的活性位点,使其他单体在其表面或特定位置形成支链结构。例如,骨胶与表氯醇的接枝共聚或木质素与丙烯酰胺的结合。

    2. 反应特点

      • 功能改性:通过接枝不同性质的支链,可改善原材料的机械性能、热稳定性或化学相容性。例如,纳米TiO₂表面接枝聚甲基丙烯酸甲酯(PMA)可增强抗紫外线老化能力。
      • 多步骤过程:需先活化主链,再引发单体聚合,最终形成“主链-支链”复合结构(、)。
    3. 应用领域

      • 材料科学:如聚丙烯(PP)的固相接枝改性。
      • 环保技术:利用造纸黑液中的木质素进行接枝共聚,实现资源再利用。
      • 生物医学:与皮肤移植(graft)的物理过程类似,但化学接枝更侧重分子层面的结构设计(、)。
    4. 相关化学方法
      除接枝共聚外,化学改性还包括氧化(oxygenation)、酯化(esterify)等,这些方法常结合使用以优化材料性能。

    该技术通过分子设计赋予材料新功能,广泛应用于工业与科研领域。如需进一步了解具体案例,可参考、2、3、5中的实验研究。

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