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Showing 1 to 13 of 13 for “"reactivity ratios"”.
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I. Reactivity Ratios of Some Vinyl Esters. Ii. Block Copolymers of Butadiene and Styrene
Made available in DSpace on 2014-12-05T19:36:38Z (GMT). No. of bitstreams: 1 0023319.pdf: 5103818 bytes, checksum: 786840632e0633b96801ed4cf4ce7bbf (MD5) Previous issue date: 1957
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Determination of Reactivity Ratios for Acrylonitrile/Methyl Acrylate Radical Copolymerization Via Nonlinear Methodologies Using Real Time FTIR
Reactivity ratios for the homogeneous free radical initiated copolymerization of acrylonitrile and methyl acrylate were measured by NMR on isolated, low conversion copolymers and by real time in situ FTIR. The system utilized azobisisobutyronitrile (AIBN) initiator in dimethyl formamide (DMF) at …
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Aminolysis of the 4-acetoxybenzoate anion catalysed by cyclodextrins
… amine are obtained. For Ì-CD, values of the reactivity ratios for the linear amines are low (<1) implying deceleration of the aminolysis reaction due to binding to the CD. In the case of Ý-CD, the reactivity ratios are slightly larger (>1 for both n -alkyl and branched amines), implying …
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Lignin acrylate derivatives and their behaviors in free radical copolymerizations
… were initiated by benzoyl peroxide. The monomer reactivity ratios were investigated for these copolymerization combinations. The copolymer compositions were analyzed by UV for GIU-co-MMA and HPGIU-co-MMA, while methoxyl content determination by HI-GC was used to determine compositions of …
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Polymeric thin films by chemical vapor deposition for the microelectronics industry
… This system also allows the calculation of reactivity ratios of PX with vinylic comonomers. A model is developed in which reactivity ratios can be determined if the following quantities are known: a) thickness vs. position of the final film; b) partial pressures of each reactive species …
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The Chemistry of Dimethacrylate-Styrene Networks and Development of Flame Retardant, Halogen-Free Fiber Reinforced Vinyl Ester Composites
… levels of styrene. The Mortimer-Tidwell reactivity ratios indicated that at low conversion more styrene was incorporated into the network at lower cure temperatures. The experimental vinyl ester-styrene network compositions deviated significantly from those predicted by the Meyer-Lowry …
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Initiated chemical vapor deposition of functional polyacrylic thin films
… was proposed based on the study of the monomer reactivity ratios and the copolymer molecular weights during iCVD copolymerization.
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The ring opening polymerization of ring strained cyclic ethers
… carried out using BF30Et2/ethanol system. The reactivity ratios were calculated as rOXT = 1.2 ± 0.30 and rTHF = 0.14 ± 0.03. These copolymers were random copolymers with no evidence of oligomer formation. The coordinated anionic catalyst, porphinato-aluminium chloride [(TPP)AICl], was used to …
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Sequence distributions in free-radical polymers
… to manipulate the use of monomers, with their reactivity ratios, thereby enabling us to design polymers with controlled sequence distributions.Hydrogel membranes, with relatively controlled sequence distributions and polymerised to 100% conversion, were synthesized to represent prospective …
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Synthesis and Characterization of Well-Defined Poly(1,3-Cyclohexadiene) Homopolymers and Copolymers
… were synthesized, and the reactivity ratios for these copolymers (r1,3CHD = 0.022, rstyrene = 0.024) were determined using a conventional Mayo-Lewis approach. The effect of aromatization and hydrogenation on the thermal properties of these copolymers was determined using …
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Synthesis, Characterization and Properties of Vinyl Ester Matrix Resins
… time to quantify conversions. Copolymerization reactivity ratios of styrene and terminal methacrylates on vinyl ester oligomers were calculated to be rs = 0.36 ± 0.05 and rm = 0.24 ± 0.1 from early conversion data obtained at 140°C on a series of resins with systematically increasing levels of …
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Structure and Properties Of dimethacrylate-Styrene Resins and Networks
… component. This may also be related to the reactivity ratios dictating styrene and vinyl ester sequence length and warrants further investigation. As expected, the volume contraction upon cure also decreased significantly as styrene was decreased, and thus residual cure stresses may be …
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Design, Synthesis and Application of Novel Degradable Materials Based on Polyesters by Radical Ring-Opening Polymerization
… copolymerized at 120 °C with various monomer ratios. It is a rare example of a system providing graft copolymers (PSt-g-β-PL) with a complete range of monomer ratios in one pot. The structure of the resulting β-PL-St copolymers was proved by using a combination of different characterization …