Controllability of radical copolymerization of maleimide and ethyl α-(n-propyl)acrylate using 1,1,2,2-tetraphenyl-1,2-bis(trimethylsilyloxy) ethane as initiator

doi:10.1002/1099-0518(20000815)38:16<2872::AID-POLA30>3.0.CO;2-X

Paper

Controllability of radical copolymerization of maleimide and ethyl α-(n-propyl)acrylate using 1,1,2,2-tetraphenyl-1,2-bis(trimethylsilyloxy) ethane as initiator

Published Aug 15, 2000 · Lianjun Shi, Decheng Wan, Junlian Huang

Journal of Polymer Science Part A

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Abstract

The radical copolymerization of maleimide (MI) and ethyl a-propylacrylate was performed using 1,1,2,2-tetraphenyl-1,2-bis(trimethylsilyloxy) ethane (TPSE) as initiator. The whole copolymerization process might be divided into two stages: in the first stage, the copolymerization was carried out on the common radical mechanism, the molecular weight of the copolymer increased rapidly in much lower conversion (, 85%), and did not depend on the polymerization time and conversion; in the second stage, molecular weight of the copolymer increased linearly with the conversion and the polymerization time. It was found, however, when the conversion was higher than a certain value, for example, more than 36%, the molecular weight of the copolymer was nearly unchangeable with the polymerization time and the molecular weight distribu- tion was widened. The effect of reaction conditions on copolymerization was discussed and the reactivity ratios were calculated by the Kelen-Tudos method, the values were rMI 5 0.13 6 0.03, rEPA 5 0.58 6 0.06 for TPSE system and rMI 5 0.12 6 0.03, rEPA 5 0.52 6 0.06 for AIBN system. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 2872-2878, 2000

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The radical copolymerization of maleimide and ethyl a-propylacrylate using 1,1,2,2-tetraphenyl-1,2-bis(trimethylsilyloxy) ethane can be divided into two stages, with molecular weight increasing linearly with conversion and

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Paper

Controllability of radical copolymerization of maleimide and ethyl α-(n-propyl)acrylate using 1,1,2,2-tetraphenyl-1,2-bis(trimethylsilyloxy) ethane as initiator

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References

Radical copolymerization of α-(n-propyl)acrylic acid with maleimide in dioxane

The copolymer of -(n-propyl)acrylic acid and maleimide in dioxane can be varied in composition from random to alternating, with dioxane playing a significant role in its composition due to hydrogen bonding.

Narrow Polydispersity Polystyrene by a Free-Radical Polymerization Process-Rate Enhancement

Camphorsulphonic acid (CSA) significantly increases the rate of polymerization in nitrixide-mediated stable free radical polymerization processes for styrene-based polymers and copolymers, resulting in narrow polydispersity resins.

Radical polymerization of styrene initiated by benzopinacolates: kinetics and comments concerning the reaction mechanism

Styrene polymerization initiated by benzopinacolates involves two steps: oligomer formation and polymerization, with unactive oligomer chain-ends not undergoing further thermal cleavage.

Oligomers of α-methylstyrene by initiation with tetraphenylethanes

Substituted tetraphenylethanes can initiate telechelic oligomers of -methylstyrene at room temperature, making them suitable for initiating freeradical polymerization in styrene and methyl methacrylate.

Polydimethylsiloxane–vinyl block polymers. II. The synthesis and characterization of block polymers by the thermolysis of polydimethylsiloxane macroinitiators containing bis(silyl pinacolate) groups

Thermolysis of polydimethylsiloxane-vinyl block polymers can produce thermoplastic elastomers or rubber-modified thermoplastics with composition-dependent mechanical properties.

Citations

Graft Copolymers of Maleic Anhydride and Its Isostructural Analogues: High Performance Engineering Materials

Graft copolymers of maleic anhydride and its isostructural analogues offer high performance engineering materials through their unique properties and applications in various fields.