查询词典 condensation polymer

The advantage of supercritical carbon dioxide used as an environmental medium in polymerization and reactions in supercritical carbon dioxide are described. It includes homogeneous free radical polymerizations, precipitation free radical polymerizations, dispersion free radical polymerizations, emulsion and inverse emulsion free radical polymerizations, cationic polymerizations, ring-opening polymerization, melt-phase condensation polymerizations, sol-gel polymerizations, polymer blend synthesis, catalytic chain transfer polymerizations, oxidative coupling polymerization, nitroxide-mediated radical dispersion, atom-transfer radical polymerization, reversible addition-fragmentation chain transfer polymerization, electrochemical polymerization, simultaneous one-pot combination of enzymatic and chemical polymerization, copolymerization of carbon dioxide used as monomer.

评述了ScCO2作为聚合反应介质的优点，以及在ScCO2中可进行的聚合反应类型，包括均相聚合、沉淀聚合、分散聚合、乳液及反相乳液聚合、阳离子聚合、开环聚合、熔融态缩聚、溶液-凝胶聚合、聚合物混合合成、链催化转移聚合、氧化-偶合反应聚合、氮氧自由基可控活性聚合、原子转移自由基聚合、可逆加成-断裂链转移、电化学聚合、原子转移聚合与酶催化开环聚合两种活性聚合在ScCO2中同时聚合、二氧化碳作为原料共聚合等。

The results show that the different amount of water addition could alter the structure of condensation polymer and the calcination temperature had great effect on phase structure and grain size.

结果表明：加水量影响醇盐水解缩聚物的结构，煅烧温度对粉体的形貌和晶粒大小有较大的影响。

It was found that the solvent type affected the gel point, the different amount of water addition could alter the structure of condensation polymer, the varying of ageing time influenced the growth of grains and the calcination temperature had great effect on phase structure and grain size.

发现不同的溶剂类型能够改变胶凝时间，加水量的多少会影响醇盐水解缩聚物的结构，陈化时间的长短直接改变晶粒的生长状态，煅烧温度的变化对粉体的相结构和晶粒大小有重要的作用。

The diamine monomer containing trifluoromethyl and ether link reacts with dianhydride monomer for condensation to produce said polymer material.

用含有三氟甲基和醚键的二胺基单体与二酐单体进行缩和反应，合成本发明的聚合物材料。

This is due to the large amount of water, the polymer has a high degree of branching structure, adding a small amount of water so that they can support each other elements of the polymer condensation to form larger, supporting a higher degree of macromolecules, Generate up to form a mesh structure on the gel.

这是由于水用量较大时，聚合物已经呈现较高支化度的结构，少量水的加入就可以使这些支化的聚合物分子相互缩聚形成更大、支化度更高的大分子，直到生成网状结构时就形成凝胶。

Short for poly, a condensation polymer that is commonly used in soft-drink bottles、fibers、engineering plastics etc.

聚对苯二甲酸乙二醇酯：PET是由乙二醇和对苯二甲酸通过缩聚反应而成的，反应过程中释放出副产物水。

Preparation of quick-dissolving carboxymethyl cellulose by crosslinking agent sodium borate ,condensation polymer dialdehydomethane and CMC is studied.

利用交联剂硼酸钠和丙二醛缩聚剂与羧甲基纤维素反应，生成速溶型CMC ，既解决了CMC溶解缓慢问题，又提高了CMC的粘

EDTA-diaminodibenzo-18-crown-6 (cis- and trans-) condensation polymer is a new compound of crown ether derivatives of EDTA.

本文报道了一种新的EDTA-二氨基二苯并-18-冠-6缩聚物顺、反异构体对铀和铀在盐酸介质中的吸附行为。

Optimization of polyester condensation process and reactor design;2. The Structure Characters of the Sulfonated Condensation Polymer Series High Performance;3. The pH value of the solution was adjusted,and the co- condensation reaction was taken place between the hydroxy groups forming transparent organic-inorganic hybrid films on polycarbonate.

以甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)水解聚合产物作为主要成膜物质，引入正硅酸乙酯水解产物硅溶胶作为无机增强物，调节两种混合溶液pH值，利用两者羟基之间的共缩聚反应在聚碳酸酯板表面制备有机/无机复合透明耐磨薄膜；采用TG/DTA、FT-IR、SEM及UV-V IS对成膜过程、薄膜性能与结构进行表征。

First, the precursor polymer with azobenzene groups on main-chain was obtained by condensation polymerization between 4,4'-dihydroxyazobenzene and N,N-(2-bromoethyl)aniline through Williamson reaction. Then the azo polymer containing azobenzene groups both on main-chain and side-chain was prepared through an azo-coupling reaction between the precursor polymer and the diazonium salt of 4-nitroaniline.

设计并合成了一种新型的主侧链均含偶氮生色团的聚合物，首先通过4，4'-二羟基偶氮苯与N，N-二溴乙基苯胺之间的Williamson反应缩聚得到主链含偶氮苯基团的先驱聚合物，再通过重氮偶合反应得到目标产物，并利用核磁共振、红外光谱、紫外可见光谱、热分析等手段确认了所制备聚合物的结构。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。