NMR analysis of butyl acrylate/methylmethacrylate/α‐methyl styrene terpolymers

McManus, Neil T.; Penlidis, Alexander

doi:10.1002/app.24469

Cited by 9 publications

(7 citation statements)

References 19 publications

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“…The copolymer composition was determined by the relative signal intensity of monomers in copolymers based on NMR spectra. In case of PBMAMA, where the methoxy group ([]OCH 3 ) and methyleneoxy ([]OCH 2 ) shows two distinct characteristic peaks [44, 45] around $\delta = 3.6$ ppm and $\delta = 4.0$ ppm, the compositions were determined by the peaks for ester linkage ([]OCH 3 ) and ([]OCH 2 ). The composition of copolymers was determined using the integrated peak areas corresponding to methoxy and methyleneoxy groups using the following formula [46, 47].…”

Section: Resultsmentioning

confidence: 99%

Thermal and sonochemical degradation kinetics of poly(n‐butyl methacrylate‐co‐alkyl acrylates): Variation of chain strength and stability with copolymer composition

Bhagat

Madras

2012

Polymer Engineering & Sci

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The thermal degradation of poly(n‐butyl methacrylate‐co‐alkyl acrylate) was compared with ultrasonic degradation. For this purpose, different compositions of poly (n‐butyl methacrylate‐co‐methyl acrylate) (PBMAMA) and a particular composition of poly(n‐butyl methacrylate‐co‐ethyl acrylate) (PBMAEA) and poly(n‐butyl methacrylate‐co‐butyl acrylate) (PBMABA) were synthesized and characterized. The thermal degradation of polymers shows that the poly(alkyl acrylates) degrade in a single stage by random chain scission and poly(n‐butyl methacrylate) degrades in two stages. The number of stages of thermal degradation of copolymers was same as the majority component of the copolymer. The activation energy corresponding to random chain scission increased and then decreased with an increase of n‐butyl methacrylate fraction in copolymer. The effect of methyl acrylate content, alkyl acrylate substituent, and solvents on the ultrasonic degradation of these copolymers was investigated. A continuous distribution kinetics model was used to determine the degradation rate coefficients. The degradation rate coefficient of PBMAMA varied nonlinearly with n‐butyl methacrylate content. The degradation of poly (n‐butyl methacrylate‐co‐alkyl acrylate) followed the order: PBMAMA < PBMAEA < PBMABA. The variation in the degradation rate constant with composition of the copolymer was discussed in relation to the competing effects of the stretching of the polymer in solution and the electron displacement in the main chain. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Thermal and sonochemical degradation kinetics of poly(n‐butyl methacrylate‐co‐alkyl acrylates): Variation of chain strength and stability with copolymer composition

Bhagat

Madras

2012

Polymer Engineering & Sci

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“…The MMA monomer shows a singlet peak corresponding to methoxy of the ester linkage (−OCH 3 ) at δ 3.8. The BA shows a triplet peak corresponding to the ethyleneoxy of the ester linkage (−OCH 2 ) at δ 4.2. − These peaks were identified in all copolymers, and the monomer compositions of the copolymers were found from the integrated peak areas, according to the following equation y m = 2 a m 3 a b 1 + 2 a m 3 a b where y m is the mole fraction of MMA in the copolymer, a m is the methoxy peak area, a b is the ethyleneoxy peak area, and the factor 2/3 arises from the ratio of protons of the specific identifying groups …”

Section: Resultsmentioning

confidence: 99%

“…The BA shows a triplet peak corresponding to the ethyleneoxy of the ester linkage (-OCH 2 ) at δ 4.2. [31][32][33] These peaks were identified in all copolymers, and the monomer compositions of the copolymers were found from the integrated peak areas, according to the following equation 34 y m )…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic and Thermal Degradation of Poly(methyl methacrylate), Poly(butyl acrylate), and Their Copolymers

Konaganti

Madras

2009

Ind. Eng. Chem. Res.

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The photocatalytic and thermal degradations of poly(methyl methacrylate), poly(butyl acrylate), and their copolymers of different compositions were studied. The photocatalytic degradation was investigated in o-dichlorobenzene in the presence of two different catalysts, namely, Degussa P-25 and combustion synthesized nanotitania (CSN-TiO2). The samples were analyzed by using gel permeation chromatography (GPC) to obtain the molecular weight distributions (MWDs) as a function of reaction time. Experimental data indicated that the photodegradation of these polymers occurs by both random and chain end scission. A continuous distribution kinetic model was used to determine the degradation rate coefficients by fitting the experimental data with the model. Both the random and specific rate coefficients of the copolymers decreased with increasing percentage of butyl acrylate (BA). Thermal degradation of the copolymers was investigated by thermogravimetry. The normalized weight loss profiles for the copolymers showed that the thermal stability of the copolymers increased with mole percentage of BA in the copolymer (PMMABA). The Ozawa method was used to determine the activation energies at different conversions. At low acrylate content in the copolymer, the activation energy depends on conversion, indicating multiple degradation mechanisms. At high acrylate content in the copolymer, the activation energy is independent of conversion, indicating degradation by a one-step mechanism.

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“…Rinaldi and coworkers studied the stereosequence of different triads in different copolymers and terpolymers by various 2D NMR techniques [73]. Composition analysis of butyl acrylate/methylmethacrylate/α-methyl styrene terpolymers was carried out by McManus et al [74] Thermogravimetric analysis (TGA) of acrylamide/acrylic acid/acrylonitrile terpolymers was performed by Rakshit and coworkers [75]. Various coworkers have reported the reactivity ratios of different terpolymers [76,77].…”

Section: Nmr Of Terpolymersmentioning

confidence: 99%

Two-dimensional NMR studies of acrylate copolymers

Brar

Goyal

Hooda

2009

Pure and Applied Chemistry

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High-resolution NMR spectroscopy is the most versatile, reliable, and generally acceptable technique for the determination of the microstructure of polymers. 2D NMR techniques, along with 1D NMR, have more potential to study absolute configurational assignments and sequence distribution of copolymers. Physical and chemical properties of polymers are influenced fundamentally by their microstructure. We discuss the detailed microstructure analysis of a large number of homopolymers, copolymers, and terpolymers. 2D NMR study of poly(methyl methacrylate) (PMMA), poly(methyl acrylate) (PMA), and poly(methacrylonitrile) (PMAN) is discussed in this article. In addition to homopolymers, 2D heteronuclear single-quantum coherence (HSQC), total correlation spectroscopy (TOCSY), and heteronuclear multiple-bond correlation (HMBC) study of different copolymers such as poly(methyl methacrylate-co-methyl acrylate), poly(styrene-co-methyl methacrylate), and poly(methyl methacrylate-co-methacrylonitrile) have also been reported here. This in turn helps in microstructural analysis of terpolymers such as poly(methacrylonitrile-co-styrene-co-methyl methacrylate), poly(acrylonitrile-co-methyl methacrylate-comethyl acrylate), and poly(ethylene-co-vinyl acetate-co-carbon monoxide).

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NMR analysis of butyl acrylate/methylmethacrylate/α‐methyl styrene terpolymers

Cited by 9 publications

References 19 publications

Thermal and sonochemical degradation kinetics of poly(n‐butyl methacrylate‐co‐alkyl acrylates): Variation of chain strength and stability with copolymer composition

Thermal and sonochemical degradation kinetics of poly(n‐butyl methacrylate‐co‐alkyl acrylates): Variation of chain strength and stability with copolymer composition

Photocatalytic and Thermal Degradation of Poly(methyl methacrylate), Poly(butyl acrylate), and Their Copolymers

Two-dimensional NMR studies of acrylate copolymers

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