4-Methyl-3-penten

Properties Poly(methyl pentene), unfilled Polyolefin ... 

It has been shown that for acrylic, glass-filled nylon and methyl pentene there is reasonable correlation between the reciprocal of the stress concentration factor, K, and impact strength. However, for PVC good correlation could only be achieved if the finite dimensions of the sample were taken into account in the calculation of stress concentration factor. 

Hence at room temperature there are no solvents for polyethylene, polypropylene, poly-4-methyl-pentene-l, polyacetal or polytetrafluoroethylene, but at temperatures of about 30°C below their melting point solvents of... 

Other polyolefins A variety of other crystalline polyolefins are available such as polybutene-1 (improved creep resistance over polyethylene), poly-4-methyl pentene-1 (excellent temperature deformation resistance) and ethylene-vinyl acetate (greater flexibility). 

Aus 2-Hydroxy-4-oxo-2-methyl-pentan wird in verdiinnter Schwefelsaure 2,4-Dihy-dwxy-2-methyl-pentan erhalten, in konzentrierter Schwefelsaure entstcht iiber das 2-Hydroxy-2-methyl-pentan 2-Methyl-penten-(2)i i. 

N-methyl-anilid)-Nickelsalz 344 -S-[4-methyl-penten-(2- bzw. 3) -ylester]-dimethyl-amid 344... 

Part 25 Determination of 4-methyl-pentene in food simulants Headspace GC with cyclohexane as internal standard... 

Furthermore, the addition of dichlorocarbene to ene-ynes proved to be remarkably sensitive to substituent effects. Trans-1,4-diphenyl butenyne gave only the cyclopropenone 17 via hydrolysis of dichlorocyclopropene 16, however, 2-methyl-pentene-l-yne-3 favored the formation of the dichlorocyclopropane 18 with only traces of products resulting from addition to the triple bond ... 

Poly(methyl pentene), unfilled Low-density Medium-density High-density Ultra high-molecular-weight Glass-fiber- reinforced, high-density Ethylene-vinyl acetate copolymer... 

While "conventional positive photoresists" are sensitive, high-resolution materials, they are essentially opaque to radiation below 300 nm. This has led researchers to examine alternate chemistry for deep-UV applications. Examples of deep-UV sensitive dissolution inhibitors include aliphatic diazoketones (61-64) and nitrobenzyl esters (65). Certain onium salts have also recently been shown to be effective inhibitors for phenolic resins (66). A novel e-beam sensitive dissolution inhibition resist was designed by Bowden, et al a (67) based on the use of a novolac resin with a poly(olefin sulfone) dissolution inhibitor. The aqueous, base-soluble novolac is rendered less soluble via addition of -10 wt % poly(2-methyl pentene-1 sulfone)(PMPS). Irradiation causes main chain scission of PMPS followed by depolymerization to volatile monomers (68). The dissolution inhibitor is thus effectively "vaporized", restoring solubility in aqueous base to the irradiated portions of the resist. Alternate resist systems based on this chemistry have also been reported (69,70). 

Materials and Purifications. 2-Methyl pentene-1 (Aldrich) was distilled under normal pressure at 62°C after refluxing for one hour 1n the presence of A1L1H.. Methyl methacrylate and para-methyl styrene (Aldrich) were distilled under reduced pressure at about 60°C the purified monomers were sealed and stored 1n refrigerator before use. The compressed gas, sulfur dioxide (Matheson), was led through a P208 tower before Introduced Into reaction system. Hydroxyethyl acrylate (Aldrich) was used for polymerization without further purification. 

Syntheses. The polymerization reaction of poly(2-methyl pentene-1 sulfone) (PMPS) was carried out at -78°C. Purified 2-methyl pentene-1 (42 grams) and condensed SO, (about 125 grams) at a molar ratio of 1 to 4 were charged into the reaction system under atmospheric pressure, and the reaction was Initiated by 2 milliliters of butyl hydroperoxide. The white polymer mass was purified by dissolving 1n acetone, then precipitating Into methanol (8). 

Methyl-penten-3-yl-l-tosylat (25 R = R = CH3) (70). Die erhohte Re-aktionsgeschwindigkeit wird auf den stabilisierenden Effekt der Methyl-Gruppen im Dbergangszustand bzw. in dem sich bildenden Cyclopropan-Ring zuruckgefiihrt (72, 73). 

THF (5 g) mixed with 0.1 ml 10 NHC1 and added slowly to 5 g of titanium isopropoxide with fast stirring. This sol was then mixed with a 10 wt% solution of triethoxysilane capped PF or PEK in THF. The final solution was cast into poly(4-methyl-pentene) Petri dishes and covered for drying and curing at 60 °C for 24 h. Films were then removed and annealed at 200 °C for 15 min... 

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