Poly ( propylene carbonate ) polyols was synthesized by the copolymerization of carbon dioxide with propylene oxide in the presence of double metallic catalyst in loop reactor 摘要以二氧化碳3环氧丙烷为原材料,在双金属氰化物催化剂催化下,利用环流反应器合成聚碳酸亚丙酯多元醇。
In conclusion , the properties of the polymers can be controlled to some extent by simply adjusting the ratio of the catalysts ( n ( fe ) / n ( zr ) ) in the in - situ copolymerization of ethylene 在乙烯原位共聚中,可以通过调节齐聚催化剂与共聚催化剂的配比对聚合产物的物理性能进行控制。
Graft copolymerization of methyl methacrylate onto carboxymethyl chitin was carried out by stirring quickly and no emulsifier , without emulsifier made the products more pure 摘要通过高速搅拌,未使用乳化剂,制备了羧甲基甲壳素和甲基丙烯酸甲酯的接枝共聚物,避免了产物中引入乳化剂杂质。
One of them , grafting copolymerization of polydimethylsiloxane oligomer with acrylate , was used to make a polyacrylate elastomer with improved compatibility to poly dimethyl siloxane ( pdms ) 采用tg呈梯度变化的聚丙烯酸酯单体共聚合的特殊分子设计,制得阻尼值均等的聚丙烯酸酯弹性体。
A series of copoly ( olefin - co - ester ) s were synthesized and characterized by starting from cyclooctene , cyclooctadiene or nobornene with ethanediol di ( 10 - undecenoate ) via metathesis copolymerization and hydrogenation reaction 摘要通过环辛烯、环辛二烯和降冰片烯-十一烯酸乙二醇二酯的易位共聚合及氢化反应合成了烯烃共聚酯。
Modification method of organo - siloxane modified acrylate latexes main includes physical blend and chemical copolymerization , the methods of organo - siloxane modified acrylate latex were reviewed 摘要多官能团有机硅功能单体对丙烯酸酯乳液改性研究主要包括物理共混和化学共聚法,本文对有机硅改性丙烯酸酯乳液的研究方法进行了系统的综述。
The other conjugation polymer was formed by copolymerization of n - ( a - naphthyl ) carbazole with l , 4 - di ( chloromethyl ) benzene . the third organic molecule was synthesized by heck reaction with 9 , 9 - di [ ( 4 - iodine ) phenyl ] fluorene and vinylcarbazole 一个共轭高聚物为n - ( -萘基)咔唑和对二氯甲基苯通过wittig - horner反应聚合得到的高分子化合物。
Organosilicone monomer mts with higher silicone content than raw monomer kh - 570 was elaborated at a fairly low output rate . afterwards , the solution polymerization of mts , mma , and copolymerization of mts and mma were carried out 研究以硅烷偶联剂kh570为原料制备了有机硅单体mts ,该单体中的硅含量较原料单体kh - 570有大幅度增加但合成产率偏低。
Progresses are reviewed in such aspects as improvement in polymerization media for fep preparation , techniques for regulating the rate of tfe / hfp copolymerization and fep modification , and technical issues of worth attention were discussed 摘要综述了聚全氟乙丙烯制备技术中聚合介质改进、共聚反应控制方法研究、聚合物改性技术等方面的进展,并提出了值得关注的工程技术问题。
The portable yag cwl - 100 laser medical apparatus is a multifunction treatment and operation instrument . concentrating the characteristic of resection copolymerization , illumination and stop bleeding . because of shorter operation hours and fewer blood Yl100型yag激光治疗仪可以配合使用的各种内窥镜有:食道镜胃镜十二指肠镜支气管镜胆道镜腹腔镜直肠镜膀胱镜结肠镜等。