Handbook of Polymer Synthesis Second Edition Episode 10 pps

... toluene and amorphous polymers during homogeneous polymerization in tetrahydrofuran. The softening points of the crystalline polymers were about 240  C [342]. Atactic polymer of t-butyl vinyl ketone ... rate of polymerization of crotonaldehyde increases with the dielectric constant of the solvent is evidence for an ionic mechanism of the polymerization. An increase in dielectri...

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...

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... homopolymers than those of the copolymers. Crosslinking with peroxides increases the impact and tensile strength of PCL and PLA copolymers [31–33]. Micromonomers were prepared from ring opening polymerization ... polymerization of cyclic ester with functionalized initiator (3). Synthesis of polycaprolactone micromonomer. ð3Þ Table 1 Copolyesters of L-lactic acid (LLA) and e-hydrox...

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... 2.065 g/cm 3 , a bulk density of 0.82, a specific surface area (BET) of 29 m 2 /g, and a particle size of 10 to 100 mm. The polymerization activity is in the vicinity of 500 L mol À1 Â s À1 [88]. 3. ... 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 þ M 1 À! k 21 CatÀM 1 ÀM 2 polymer ð34Þ...

Ngày tải lên: 13/08/2014, 16:21

... polymerization [28]. Compound C tr T/  C Benzene 2 Â 10 À5 100 Toluene 5 Â 10 À5 100 Ethylbenzene 1.4 Â 10 À4 100 Isopropylbenzene 2 Â 10 À4 100 Styrene 5 Â 10 À5 100 Dichloromethane 1.5 Â 10 À5 60 Chloroform ... TiCl 4 and AlEt 3 [104 ,105 ] and of a TiCl 3 /Al(i-Bu) 3 mixture [106 ] in a temperature range of 0  Cto10  C. The Al/Ti ratio has to be 3:1 for the fo...

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... 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

... 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...

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... 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 ... this, the polymerization of 1-phenyl-1,3-butadiene was found to produce polymers with high contents of 3,4- but no 1,2-structures. Generally, the molecular weights are low, with...

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... 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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... 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