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Poly microstructure investigations

The mechanism of chloroprene polymerization is summarized in Scheme 4.11. Coleman et ai9iM have applied l3C NMR in a detailed investigation of the microstructure of poly(chloroprene) also known as neoprene. They report a substantial dependence of the microstructure on temperature and perhaps on reaction conditions (Table 4.3). The polymer prepared at -150 °C essentially has a homogeneous 1,4-tra/rv-niicrostructure. The polymerization is less specific at higher temperatures. Note that different polymerization conditions were employed as well as different temperatures and the influence of these has not been considered separately. [Pg.184]

To our knowledge, there is only one study in which the influence of magnesium alkyl cocatalysts on microstructure of poly(diene)s was investigated. Duvakina et al. used the catalyst system Nd(d3/TBP/Mg( C4H9)( Q H17) for BD polymerization and investigated the influence of the molar ratio Mg/ Nd in the range of 6-60. This increase of Mg/ Nd led to a decrease in trans- 1,4-contents from 95 to 88-85% while the 1,2-content increased [135,136]. [Pg.41]

Reductive Dehalogenation with Tri-w-butyltin Hydride A Powerful New Technique for Use in Poly(vinyl chloride) Microstructure Investigations... [Pg.329]

Cha WI, Hyon SH, Ikada Y (1993) Microstructure of poly(vinyl alcohol) hydrogels investigated with differential scanning calorimetry. Macromol Chem Phys 194 2433-2441... [Pg.318]

Kleinschmidt, R. Reffke, M. Fink, G Investigation of the microstructure of poly(propylene) in dependence of the polymerization temperature for the systems Pr[3-RCpFlu]ZrCl2/MAO, with R = H, Me, Et, Pr, Bu, and Pr[IndHu]ZrCl2/MAO. Macromol. Rapid Common. 1999, 20, 284-288. [Pg.77]

Arndt, M. Kaminsky, W. Polymerization with metallocene catalysts. Hydroohgomerization and NMR investigations concerning the microstructure of poly(cyclopentenes). Macromol. Symp. 1995, 95, 167-183. [Pg.411]

We have recently found that pure a-fluorostyrene can be polymerized by the conventional free radical method and that poly-(a-fluorostyrene) solutions can be stabilized by weak or highly hindered bases. This finding enabled us to investigate the microstructure of poly(a-fluorostyrene) by C-NMR spectroscopy. [Pg.285]

Recently the microstructures of liquid oligobutadienes and poly(l-phenylbutadiene) have also been examined, while stereoregular oligomerizations of isoprene by magnesium alkyls are also reported.In addition, polymerizations of the structurally closely related monomer acrolein have been similarly investigated. ... [Pg.272]

The microstructure of segmented block copoly(ether esters) composed of poly(tetramethylene oxide) (PTMO) soft blocks and poly(butylene terephtha-late) (PBT) hard blocks was investigated by a variety of analytical techniques, including C solid-state NMR. ... [Pg.260]

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See also in sourсe #XX -- [ Pg.324 ]



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Poly microstructure

Poly microstructures

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