Handbook of Polymer Synthesis Second Edition Episode 13 pdf

... University of Technology, Kaunas, Lithuania I. FOREWORD Since 1992 when the first edition of the Handbook of Polymer Synthesis was published a number of new applications for photoconductive polymers ... et al. [139 ] and Bradley [140]. One of the major improvements was the use of tetrahydrothiophene instead of dimethyl sulphide in the synthesis of the precursor polym...

Ngày tải lên: 13/08/2014, 16:21

... kind of polymerization is often limited by the occurrence of side reactions, including (1) the attack of the initiator at the carbonyl double bond of the monomer or polymer, (2) chain transfer of ... preparation of ABA block copolymers when bifunctional initiators are used, whereas the first method enables the synthesis of triblock copolymers by addition of the first monomer...

Ngày tải lên: 13/08/2014, 16:21

... example of a solid phase synthesis on polymer support which was followed by the development of numerous polymeric reagents [148]. Presently, the fast expanding technique of combinatorial organic synthesis ... of the great number of hydroxyl groups in the prepolymer, curing with dianhydrides can form very densely crosslinked, second- stage polymers if used in relatively high c...

Ngày tải lên: 13/08/2014, 16:21

... [128,129] , Patat and Sinn [130 ], Shilov [131 ], Henrici-Olive and Olive [132 ], Reichert and Schoetter [133 ], and Fink et al. [134 ,135 ]. With respect to the kinetics of polymerization and side reactions, ... comonomer, as it promotes the polymer s degradability in the presence of light [182]. As a consequence of the diversified nature of the comonomers, a large number of varian...

Ngày tải lên: 13/08/2014, 16:21

... conditions of radical-induced vinyl polymerization (e.g., the rate of polymerization was found to be proportional to the square root of the initiator concentration). However, the average degree of polymerization ... of phenol and acetone by the cumene oxidation process. The polymerizat ion characteristics of a-methylstyrene are considerably different from those of styrene. Wherea...

Ngày tải lên: 13/08/2014, 16:21

... course of the polymerization [247–249]. Particularly attractive aspects of this technique of radiation polymerization are the excellent efficiency of polymerization together with the high rates of polymerization ... the degree of polymerization should be a function of the number of polymer lattices and initiator con centration. However, for the polymeri- zation of VC in emul...

Ngày tải lên: 13/08/2014, 16:21

... rings: ð64Þ At a polymerization temperature of 22  C, approximately 80% of the cyclopentane rings in the polymer are trans. Table 23 shows some other examples of the polymerization of nonconjugated ... coordination of the monomer occurs with only one double bond for both isomers of pentadiene. In the presence of CrO 3 only the trans-isomer of pentadiene is polymerized to a...

Ngày tải lên: 13/08/2014, 16:21

... Ziegler–Natta polymerization of norbornene (NBE) – received by means of TiCl 4 /EtMgBr catalysts a novel polymer [2,3]. In 1957 Eleuterio (Du Pont) filed a patent, which describes the polymerization of severa ... predictions [267]. These secondary metathesis reactions of course may also affect the microstructure of the polymers, e.g., the fraction of cis double bonds [275,283]. Th...

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... discussion of hyperbranched polymers will be presented in a separate chapter of this handbook. D. Unusual Synthetic Methods The discussion of unusual methods reported for syntheses of PEKs is ... homopoly- mers a series of copolymers with systematic variation of the hydroquinone/resorcinol ratio was studied. Anothe r publication [ 113] reported on an analogous series of copoly...

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... respectively. Setting the number of moles of the polyol, n pol ,tobe1,r becomes the number of moles of the chain extender. Number of moles of the diisocyanate, n ISO , at the stoichiometric ratio of NCO/OH groups ... the immiscibility of the hard and soft segments. Degree of phase separation (or phase mixing) affects the properties of the polymers, and it depends on the str...

Ngày tải lên: 13/08/2014, 16:21