Linkage Configuration and Triad Distribution in the Copolymers of Isobutyl Vinyl Ether andN-Phenyl-maleimide Prepared in Chloroform and in Methyl Ethyl Ketone

Hao, Xiaojuan; Fujimori, Kiyohisa

doi:10.1002/1521-3935(20010901)202:13<2783::aid-macp2783>3.0.co;2-x

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…In recent studies of alternating copolymerization systems in which CTCs are formed between pairs of electron‐rich and electron‐deficient comonomers, a link has been found to exist between the alternating tendency and the stereoregularity of comonomer units 45, 54, 55. In such cases, the ratio of cis configurations to trans configurations was found to increase along with the tendency of the comonomers to alternate 56.…”

Section: Resultsmentioning

confidence: 96%

Synthesis and characterization of new alternating, amphiphilic, comblike copolymers of poly(ethylene oxide) macromonomer and N‐phenylmaleimide

Cianga

Sarac

Ito

et al. 2004

J. Polym. Sci. A Polym. Chem.

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A surface-active p-vinyl benzyloxy--hydroxy-poly(ethylene oxide) macromonomer containing 22 pendant structural units of ethylene oxide (St-PEO 22 ) was synthesized with an initiation method. Because of its solubility in a large variety of solvents, the free-radical copolymerization with electron-acceptor N-phenylmaleimide (NPMI) was performed at 60°C in benzene and tetrahydrofuran (THF) as isotropic media and in a water-THF mixture or water as a heterogeneous medium. Oil-soluble 2,2Ј-azobisisobutyronitrile and water-soluble 4,4Ј-azobis(4-cyanovaleric acid) were used as the initiators at fixed concentrations. Two different St-PEO 22 /NPMI comonomer ratios (1/1 and 3/7) at a fixed total comonomer concentration in the polymerization system were used. The structures, compositions, and microstructure peculiarities of the obtained alternating, amphiphilic, comblike copolymers were determined by NMR analysis. For the copolymers synthesized in hydrophilic media, differential scanning calorimetry showed, near the endothermic peak attributed to the melting of the poly-(ethylene oxide) side chains, the presence of a second peak due to the partially ordered phase that could exist between the crystalline state and the isotropic melt. Also, the thermal stability of the obtained copolymers was studied with thermogravimetric analysis.

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Section: Resultsmentioning

confidence: 96%

Synthesis and characterization of new alternating, amphiphilic, comblike copolymers of poly(ethylene oxide) macromonomer and N‐phenylmaleimide

Cianga

Sarac

Ito

et al. 2004

J. Polym. Sci. A Polym. Chem.

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“…To effectively enhance the monomer conversion, the supernatant containing unreacted NPMI and LIM was reused Owing to the rigid molecular structure of LIM in combination with imide rings of NPMI in the backbones, the as-prepared poly(NPMI-co-LIM) microspheres exhibit remarkable thermal stability and mechanical property. 44,45 To characterize the heat resistance of poly(NPMI-co-LIM) microspheres with different copolymer compositions, TGA measurements were performed. As displayed in Figure 7, the poly(NPMI-co-LIM) microspheres obtained at varying monomer feed ratios all showed high heat resistance.…”

Section: Growth Mechanism Of the Poly(npmi-co-lim) Microspheresmentioning

confidence: 99%

“…Moreover, the M n of poly(NPMIco-LIM) only decreased slightly from 4.5 × 10 3 to 3.8 × 10 3 , and the polymer dispersity index became a little broader as summarized in Table S10. 44,45 To characterize the heat resistance of poly(NPMI-co-LIM) microspheres with different copolymer compositions, TGA measurements were performed. As displayed in Figure 7, the poly(NPMI-co-LIM) microspheres obtained at varying monomer feed ratios all showed high heat resistance.…”

Section: Growth Mechanism Of the Poly(npmi-co-lim) Microspheresmentioning

confidence: 99%

Facile and Efficient Synthesis of Heat-Resistant Poly(N-phenylmaleimide-co-limonene) Microspheres Bearing Endocyclic Vinyl Groups Based on Bio-Based Limonene

Chen

Kuang

Jiang

et al. 2023

Ind. Eng. Chem. Res.

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Limonene (LIM), a bio-based cyclic monoterpene, has received extensive attention due to it abundance, environmentfriendliness, and sustainability. However, the efficient preparation of LIM-based polymers remains a great challenge owing to severe steric hindrance of endocyclic double bonds and the significant selfinhibition effect of the exocyclic allyl group. Herein, we developed a facile and efficient method for the preparation of heat-resistant poly(N-phenylmaleimide-co-limonene) [poly(NPMI-co-LIM)] microspheres bearing endocyclic vinyl groups through self-stabilized precipitation polymerization. The influence of the solvent composition, monomer concentration, and monomer feed ratio on the yield and size of poly(NPMI-co-LIM) microspheres were systematically studied. Monodisperse poly(NPMI-co-LIM) microspheres with tunable sizes and copolymer compositions were facilely obtained in butanone/n-heptane (4/6, v/v) through simple adjustment of the monomer feed ratio and monomer concentration. As the total monomer concentration increased from 0.1 to 0.8 mol/L ([NPMI]/[LIM] = 1/1), the number-average particle size increased gradually from 0.42 to 1.23 μm. More importantly, the as-prepared poly(NPMI-co-LIM) microspheres can be simply separated, and the supernatant containing unreacted monomers can be directly reused, which is conducive to improving monomer conversion. After four consecutive reusing cycles, the overall conversion of LIM and NPMI increased up to 46 and 92%, respectively. Furthermore, the unreacted endocyclic double bonds in the side group of poly(NPMI-co-LIM) provide a versatile platform for chemical modification.

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“…24 Furthermore, the reactive double bond in maleimide is an electron-deficient group, which makes it easy for maleimide to form alternating copolymers with electron-rich monomers such as styrene, vinyl ether, and isobutene. [25][26][27][28][29][30] The (co)polymers of maleimide usually have a relatively high glass transition temperature (T g ) and thermal decomposition temperature, since the polymer chains are hindered by the rigid five-membered ring. 31 In the present study, we utilized N-(1phenylethyl)maleimide (N-PEMI) as a comonomer to conduct copolymerizations with styrene (St) for preparing the designed polymer microspheres.…”

Section: Introductionmentioning

confidence: 99%

Heat-resistant poly(N-(1-phenylethyl)maleimide-co-styrene) microspheres prepared by dispersion polymerization

et al. 2012

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Linkage Configuration and Triad Distribution in the Copolymers of Isobutyl Vinyl Ether andN-Phenyl-maleimide Prepared in Chloroform and in Methyl Ethyl Ketone

Cited by 5 publications

References 5 publications

Synthesis and characterization of new alternating, amphiphilic, comblike copolymers of poly(ethylene oxide) macromonomer and N‐phenylmaleimide

Synthesis and characterization of new alternating, amphiphilic, comblike copolymers of poly(ethylene oxide) macromonomer and N‐phenylmaleimide

Facile and Efficient Synthesis of Heat-Resistant Poly(N-phenylmaleimide-co-limonene) Microspheres Bearing Endocyclic Vinyl Groups Based on Bio-Based Limonene

Heat-resistant poly(N-(1-phenylethyl)maleimide-co-styrene) microspheres prepared by dispersion polymerization

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