Handbook of Polymer Synthesis Second Edition Episode 17 pot

... synthesis of ABA triblock copolymers with macro-iniferter technique. Polymer, 42(7): 3033–3042. 194. Greiner, A., et al. (2000). Method for synthesis of block polymers by controlled radical polymerization ... enables the synthesis of new block copolymers. However, the efficiency of the block copolymer synthesis, as well as the consumption of the initial transfer agent depends...

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 ... are possible for the polymerization (R 1 ¼ R 2 ¼ CH 2 OH) [170 ,469]. b The cis-content and the configuration of the resultant polymer is dependent on the solvent [170 ,470...

Ngày tải lên: 13/08/2014, 16:21

... kinetic scheme of binary copolymerization in the case of olefin insertion reaction is CatÀM 1 polymer þ M 1 À! k 11 CatÀM 1 ÀM 1 polymer ð32Þ CatÀM 1 polymer þ M 2 À! k 12 CatÀM 2 ÀM 1 polymer ð33Þ CatÀM 2 polymer ... 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 nu...

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

... 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

... substitution from hydroquinone and an excess of DFBP (109). They were used in turn for syntheses of PES block copolymers (110) [177 ,178 ]. Blockcopolymers containing dimethyl siloxane segments ... and early exploration of these methods has been reviewed in the 1st edition of this handbook (Chapter 9). ð54Þ In a publication of 1988 [79] (not reviewed before) polycondensations o...

Ngày tải lên: 13/08/2014, 16:21

... 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

... non-curable polymers containing pendant imide rings have been synthesized and studied with the objective of improving the properties of classical addition polymers [234–237]. The synthesis of these polymers ... 300  C, isomerization of the as-prepared endo norbornenyl isomer takes place, then a retro Diels–Alder process occurs with evolution of cyclopentadiene, and then polymeriz...

Ngày tải lên: 13/08/2014, 16:21