transition polymerization
1.The thermal characteristics of toner were introduced. The relations of toner composition with glass transition temperature,softening temperature and melting index were investigated. The glass transition temperature of polymerization toner were tested,and compared with calculational value.
2.The methods and mechanisms of thermal, anionic, transition metal catalyzed ring-opening polymerization (ROP), as well as the structure, property and potential applications of resultant polyferrocenophanes have been described.
3.Ethyl 2-chloropropionate〔2-(EPN)Cl〕,2?2-dipyridyl(BPY) and cuprous chloride(CuCl) were used as the initiator of transition metal catalyzed atom transfer free radical polymerization of styrene.
4.For the purpose of overcoming the deficiency of fabricating toner by means of pulverization, this article aims to describe the particle size distribution, appearance features and glass transition temperature obtained by means of suspension polymerization, dispersion polymerization for fabrication of toner, mastersizer instrument, scanning electronic microscope (SEM) and characterization of differential scanning calorimetry (DSC).
5.The glass transition temperature of the three toners respectively produced by means of suspension polymerization, dispersion polymerization and the suspension polymerization with the addition of CCA is without exception lower than that of the commercial toner produced by means of
6.STUDIES OF ETHYLENE POLYMERIZATION OVER EXCHANGED ZEOLITE Ⅰ. POLYMERIZATION OF ETHYLENE OVER VARIOUS TRANSITION-METAL EXCHANGED ZEOLITES
7.The polymer of p-tert-butylstyrene(tBS)has a relative high glass transition temperature and is soluble in aliphatic solvent.It has a comprising prospect of application in many areas including the development of novel materials,theoretical research,dispersion polymerization,unpolluted paints,oil additives,and so on.
8.Ethylene polymerization via silica|supported late transition metal complexes {[2,6|ArN=C|(Me)-2C-5H-3N]FeCl-2} ( Ar=2,6| i Pr-2C-6H-3) I with AlEt-3 has been studied.
9.The results show that the glass transition temperature of toner is about 62-74℃ when the ratio of St to BA is 3-5,stirring speed is (1 000 r/min,)ultrasonicdispersion time is 15 min,the ratio of water to oil is 7,the dosage of PVA is 4% and the polymerization temperature is 85℃. The thermal characteristics of polymerized toner can meet with the commercial requirements.
10.The preparation of functionalized mesoporous molecular sieves were introduced, which are including the formation of the acid active sites, redox active sites and used the support for immsobilizing enzyme catalysts by heteroatomic substitution; the formation of polymerization active sites, acid active sites or chiral catalysis sites by the organic-inorganic graft (or hybridization); as the carriers, the transition metals, transition metal oxides and acid catalysts are supported.
