Poly methylbutene

The temperature of polymerization can have some effect. This was observed in the polymerization of 3-methylbutene-1. At lower temperatures the amount of 1,3 versus 1,2 placement apparently increases rapidly. At -130 °C, an essentially pure crystalline 1,3-poly (methylbutene-1) forms. The nature of the counterion also has an effect on the slope of the product composition curve. The polarity of the solvent, however, apparently does not, nor does the monomer concentration. ... 

It has been observedt that poly(1,1-dimethyl propane) is the product when 3-methylbutene-l is polymerized with AICI3 in ethyl chloride at -130°C. Write structural formulas for the expected repeat units and those observed and propose an explanation. 

The above conclusions were indirectly corroborated by NMR spectra of isotactic, Ziegler type poly(3-methylbutene-l) having a bonafide conventional 1,2 head-to-tail structure (167) shown in Fig. 4. The NMR spectra of the cationic and isotactic polymers are completely different (160). 

A soluble model compound of head-to-tail poly (3-methylbutene-l) was prepared by polymerizing isoprene specifically in the 3,4 position and... 

Crystalline cationic poly(3-methylbutene-l) exists in two distinct crystalline phases which are called a and / modifications (165). Both cationic forms are different from the isotactic polymer as judged from their respective X-ray d spacings. The a modification is more stable than the /S form. The repeat distance of an oriented a specimen was found to be 7.8 A which indicates 2 structural units per repeat distance assuming 1,3 enchainment. 

The infrared spectra of cationic and isotactic poly(3-methylbutene-l) and hydrogenated-3,4-polyisoprene were studied and most of the bands were assigned. The highlights of these studies are summarized in Table 2. 

Recently Ketley (168) provided direct evidence for the 1,3 structure of catiofnic poly(3-methylbutene-l). He polymerized 1,1-dimethyl cydo-... 

Methylbutene-l, 4-methylpentene-1 and 5-methylhexene-l represent a homologous series. Thus, it is conceivable that intramolecular hydride shift polymerization will also occur with the latter two monomers. Indeed NMR spectra seem to suggest that a predominantly 1,4 and 1,5 type isomerization polymerization occurs when 4-methylpentene-1 and 5-methylhexene-l are reacted with catalysts of the Lewis acid type at low temperatures (—73° C.) (163). According to the NMR evidence, low temperature cationic poly(4-methylpentene-l) shows only 2 sharp peaks, characteristic for the CH3 and CH2 groups. This is in agreement with a gem. dimethyl structure of the a,a-dimethylbutane type ... 

Poly-(2-methylpropenej (Numbered Series) Poly-j2-methylpropene) Argon Poly-(2-methylpropenejButane Poly-(2-methylpropene)Carbon Oxide Poly-(2-methylpropene) Ethane Poly-(2-methylpropene) Krypton Poly-(2-methylpropene) Methane Poly-(2-methylpropene) Neon PolH2-methylpropene) Nitrogen Poly-(2-methylpropene) Pentane Poly-(2-methylpropene) Propane Poly-(2-methylpropene) 2- Methylbutane Poly-(2-methylpropene) 2,2- Dimethylpropane Poly-(2-methylpropene) <- 3- Methylbutene Poly-(2-methylpropyl Vinyl Ether) Poly-(2,2,3,3,4,4,4- Heptafluorobutyl Acrylate) Poly-(2,6- Xylyl Ether) (Also Irradiated) Poly-j3,3- Bis(Chloromethyl)oxacyclobutane) see Poly-(3,3- Bis(Chloromethyl)oxetane) Poly-(3,3- Bis(Chloromethyl)oxetane)... 

The IR spectra demonstrate that real copolymerization of these monomers takes place when TiCl4— Al(koC4H9)3 is used as the catalyst system The 778 cm band [the helix band of poly-3-methylbutene-l, see Section II.C.2e] disappears from tte copolymer spectra, b inning from 50% vinyl cyclohexane content, and the relative intensity of the 1120cm band decreases significantly ... 

Poly(methacrylonitrile-co- styrene) 10 1 mole ratio Ambient to 500 Ethene, isobutene, HCN, methacrylonitrile, styrene, toluene, a-methylstyrene, p-methylstyrene, 2-phenylbutene, 4-cyano-2,4-dimethylpentene, 4-phenyl-2-methylbutene, 3-phenyl- 2-propenenitrile, chain fragments 279... 

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