نتایج جستجو برای: comonomer
تعداد نتایج: 286 فیلتر نتایج به سال:
The solid-state structures, thermal properties, and enzymatic degradability of melt-crystallized films of random copolymers of (R)-3-hydroxybutyric acid (3HB) with different hydroxyalkanoic acids were investigated. The crystallinity, lamellar thickness, and spherulite growth rate of copolymers decreased with an increase in the carbon numbers of second monomer units for copolymers with an identi...
Some innovative solutions are proposed to the problem of the unavoidable physical migration of antioxidants from plastic films for packaging, in order to minimize the consequent undesirable effect of food contamination. In previous exploratory tests, phenolic antioxidant co-units were achieved and incorporated into polyethylene chain and now the work is extended to create new families of polyme...
highly active metallocenes and other single site catalysts have opened up the possibility of polymerizing cycloolefins such as norbornene (n) or of copolymerizing them with ethene (e) or propene (p). the polymers obtained show exciting structures and properties. e-n copolymers are industrially produced materials, with variable and high glass transitions depending on the wide range of their micr...
Transition metal-catalyzed copolymerization of CO and ethylene has a strong inherent propensity to produce the strictly alternating copolymer. In this work, nickel catalysts capable both homopolymerization are developed explore possibility non-alternating under assumption that comonomer incorporation in polymer chain can be adjusted by concentrations comonomers. Both polyketones with slightly m...
The synthesis and solution and solid-state structural characterization of a family of amine bis(phenolate) [ONNO]-vanadium complexes is reviewed. These compounds have oxi dation states ranging from vanadium(II) to vanadium(V), and were evaluated as olefin polymerization catalysts. In association with EtAlCl2 cocatalyst, we studied the homo polymerization of ethylene, propene, and 1-hexene, as w...
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