Studies on the copolymerization of methyl methacrylate and N‐aryl maleimides

Choudhary, Veena; Mishra, Alok Kumar

doi:10.1002/(sici)1097-4628(19961024)62:4<707::aid-app14>3.3.co;2-p

Cited by 11 publications

(17 citation statements)

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“…Higher T g values observed in the case of MMA‐OI copolymers could be explained on the basis of steric hinderance caused by the presence of chloro‐substituent at the ortho position, which may hinder the mobility of the main chain, whereas higher values of T g in the case of MMA‐PI copolymers than MMA‐MI copolymers could be explained on the basis of enhanced polar–polar intermolecular interactions due to the presence of polar substituents at the para position. A similar trend has been reported in the case of MMA–N‐( o/m/p ‐chlorophenyl) maleimide copolymers 6, 7. A significant increase in T g (i.e., 18–57°C) was observed upon incorporation of very low mol fractions (i.e., 0.2) of itaconimides.…”

Section: Resultssupporting

confidence: 85%

“…A significant increase in T g (i.e., 18–57°C) was observed upon incorporation of very low mol fractions (i.e., 0.2) of itaconimides. As expected, T g of MMA–itaconimide copolymers was lower than their corresponding MMA–maleimide copolymers of similar structure and copolymer composition 6, 7, 18…”

Section: Resultssupporting

confidence: 79%

“…Higher values of reactivity ratios for various itaconimide monomers have been reported in the case of copolymerizations with styrene 11–15, 19. It was not possible to incorporate higher amounts of maleimides, whereas the amounts of itaconimides incorporated are higher than the feed compostion, thereby indicating that the itaconimides are more reactive compared to maleimides 6, 7…”

Section: Resultsmentioning

confidence: 98%

“…The melting points noted from the endothermic peak position were found to be 127.4, 115, and 90°C for PI, MI, and OI, respectively. The position of chloro‐substituent in N‐aryl maleimides also showed an effect on the melting point 6…”

Section: Methodsmentioning

confidence: 99%

“…In our earlier articles1–8 we have reported the homopolymerization and copolymerization of N‐aryl substituted maleimides having electron releasing/or electron withdrawing substituents with methyl methacrylate (MMA). Maleimides contain 1,2 disubstituted double bonds, which has a low tendency to homopolymerize due to kinetic considerations.…”

Section: Introductionmentioning

confidence: 99%

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Studies on the copolymerization of methyl methacrylate with N‐(o/m/p‐chlorophenyl) itaconimides

Anand

Choudhary

2001

J of Applied Polymer Sci

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ABSTRACT:The article describes the synthesis and characterization of N-aryl itaconimide monomers such as: N-(p-chlorophenyl) itaconimide (PI)/N-(m-chlorophenyl) itaconimide (MI)/N-(o-chlorophenyl) itaconimide (OI) and its copolymerization behavior with MMA. The homopolymers and copolymers of N-aryl itaconimides and methyl methacrylate (MMA, M 2 ) were synthesized by varying the mol fraction of N-aryl itaconimides in the initial feed from 0.1 to 0.5 using azobisisobutyronitrile (AIBN) as an initiator and tetrahydrofuran (THF) as the solvent. Copolymer composition was determined using 1 H-NMR spectroscopy [by taking the ratio of intensities of signals due to OOCH 3 of MMA (␦ ϭ 3.59 ppm) and the aromatic proton (␦ ϭ 7.2-7.5 ppm) of N-aryl itaconimides] and percent nitrogen content. The reactivity ratios were found to be r 1 ϭ 1.33 and r 2 ϭ 0.36 (PI-MMA) r 1 ϭ 1.15 and r 2 ϭ 0.32 (MI-MMA) and r 1 ϭ 0.81 and r 2 ϭ 0.35 (OI-MMA). Molecular weight as determined using high-performance liquid chromatography decreased with increasing mol fraction of itaconimides in copolymers. All the polymers had a polydisperstivity index in the range of 1.5-2.6.Thermal characterization was done using differential scanning calorimetry and dynamic thermogravimetry in nitrogen atmosphere. Incorporation of these N-aryl itaconimides in PMMA backbone resulted in an improvement in glass transition temperature (T g ) and thermal stability. Percent char increased with the increase of PI/MI/OI content in the copolymers.

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studies on the copolymerization of methyl methacrylate with N‐(o/m/p‐chlorophenyl) itaconimides

Anand

Choudhary

2001

J of Applied Polymer Sci

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Effect of polymeric additives on properties of glass-bisphenol A dicyanate laminate composites

Mathew

Nair

Ninan

2000

J. Appl. Polym. Sci.

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The polycyanurate network matrix derived from the thermal, dibutyl tin dilaurate catalyzed polymerization of bisphenol A dicyanate was modified in their glass-laminate composites with different linear polymeric additives bearing pendant phenol, cyanate, and epoxy functions. The mechanical properties and fracture energy for delamination of the glass-laminate composites were estimated as functions of the backbone structure and concentration of the various additives. The effect of altering the nature or concentration of the functional group for a given backbone structure of the additive was examined in some cases. Except for the epoxy functional acrylic polymer, all other systems adversely affected the fracture energy for delamination of the composites due to either plasticization or embrittlement of the matrix. With the exception of the styrene-hydroxyphenyl maleimide (SPM) copolymer, the other modifiers impaired the mechanical properties and adversely affected the thermomechanical profile of the composites. In the cases of the phenol functional acrylic polymer and its cyanate derivative, plasticization of the matrix by the partly phase-separated additive, which eased the fiber debonding, appears to be responsible for the impairment of the mechanical properties. The high glass transition temperature SPM copolymer enhanced the resin-reinforcement interaction through dipolar interactions induced by the hydroxyl groups, which resulted in amelioration of the mechanical properties. However, its possible coreaction and formation of a brittle, homogeneous phase with the polycyanurate was conducive for poor damage tolerance. The SEM analysis of the fractured composites showed that in the elastomers fiber debonding is the major cause for delamination. Although the presence of SPM led to a stronger interphase, failure occurred either in the brittle matrix or through fiber breakage.

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Synthesis, characterizations and thermal behavior of methyl methacrylate andN-(p-carboxyphenyl) methacrylamide/acrylamide copolymers

Mishra

Choudhary

2000

J. Appl. Polym. Sci.

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The synthesis, characterization, and thermal properties of copolymers of methyl methacrylate (MMA) and N‐(p‐carboxyphenyl) methacrylamide/acrylamide (CPMA/CPA) are described. The copolymerization was carried out in solution by taking different mole fractions (0.1–0.5) of CPMA/CPA in the initial feed using azobisisobutyronitrile as an initiator and dimethylformamide as a solvent at 60°C. The copolymer composition was determined from 1H‐NMR spectra by taking the ratio of the proton resonance signal due to the OCH3 of MMA (δ = 3.59 ppm) and the aromatic protons (δ = 7.6–7.8 ppm) of CPMA/CPA. The monomer reactivity ratios of MMA:CPMA and MMA:CPA were determined using the Fineman Ross and Kelen Tudos methods and were found to be 1.32 ± 0.01 [MMA], 1.11 ± 0.02 [CPMA], 2.60 ± 0.01 [MMA], and 0.20 ± 0.01 [CPA]. Incorporation of these comonomers in the MMA backbone resulted in an improvement in the glass‐transition temperature and thermal stability. The percent char also increased with the increase of CPMA/CPA content in the copolymers. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 259–267, 2000

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Studies on the copolymerization of methyl methacrylate and N‐aryl maleimides

Cited by 11 publications

References 0 publications

Studies on the copolymerization of methyl methacrylate with N‐(o/m/p‐chlorophenyl) itaconimides

Studies on the copolymerization of methyl methacrylate with N‐(o/m/p‐chlorophenyl) itaconimides

Effect of polymeric additives on properties of glass-bisphenol A dicyanate laminate composites

Synthesis, characterizations and thermal behavior of methyl methacrylate andN-(p-carboxyphenyl) methacrylamide/acrylamide copolymers

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