Chemical composition distribution of a graft copolymer prepared from macromonomer: fractionation in demixing solvents

Stejskal, Jaroslav; Straková, Dagmar; Kratochvı́l, Pavel; Smith, Steven D.; McGrath, James E.

doi:10.1021/ma00192a058

Cited by 40 publications

(16 citation statements)

References 7 publications

(12 reference statements)

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“…Number-average molecular weight (M n ) and molecular weight dispersion (D) of PMMA were measured by GPC (Waters 105-CV), with several columns (Styragel 10 6 ϩ 10 5 ϩ 10 3 ϩ 500 Å) and toluene or THF as eluent (1 mL/min). IR (Bomem DA 3.002) and 29 Si-(Bruker MSL-200) and 13 C-NMR (Bruker MSL-200) were used as required. Proton spin-spin relaxation was measured at room temperature via solid-state 13 C-NMR using the pulse sequence described by Tékély.…”

Section: Characterizationmentioning

confidence: 99%

“…This result is indirect proof that the PSXE is chemically incorporated into PMMA. 26 A set chemical shift for PMMA observed at 178, 56, 52, 45, and 17 ppm in the 13 carboxyl, methylene, methoxy, quaternary, and methyl carbons, respectively. This broadening of the methyl resonance (17 ppm) is a general phenomenon for polymers with rapidly reorienting side groups or main chain carbons subject to motion.…”

Section: Characterizationmentioning

confidence: 99%

“…Yamashita et al prepared the methacrylate type of silicon macromonomer and reported the synthesis of graft polymer by copolymerizing with MMA. 6 -10 McGrath [11][12][13] and Kawai 14 further studied the free radical copolymerization of methacrylate functional siloxanes with MMA. The advantage of the macromonomer method is that the number and length of the grafted branches can be easily controlled.…”

Section: Introductionmentioning

confidence: 99%

“…13 C-NMR spectra of various graft copolymers (A) PSXE a (20)-g-PMMA18, (B) PSXE a (15)-g-PMMA18, (C) PSXE a (10)-g-PMMA18, and (D) PSXE a (7.5)g-PMMA18.…”

mentioning

confidence: 99%

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Characterization and degradation of the poly(methylphenylsiloxane)-poly(methyl methacrylate) graft copolymer

Chang¹,

Liao²,

Wu³

et al. 1998

J. Polym. Sci. A Polym. Chem.

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Poly(methylphenylsiloxane)–poly(methyl methacrylate) graft copolymers (PSXE‐g‐PMMA) were prepared by condensation reaction of poly(methylphenylsiloxane)‐containing epoxy resin (PSXE) with carboxyl‐terminated poly(methyl methacrylate) (PMMA), and they were characterized by gel permeation chromatography (GPC), infrared (IR), and 29Si and 13C nuclear magnetic resonance (NMR). The microstructure of the PSXE‐g‐PMMA graft copolymer was investigated by proton spin–spin relaxation T2 measurements. The thermal stability and apparent activation energy for thermal degradation of these copolymers were studied by thermogravimetry and compared with unmodified PMMA. The incorporation of poly(methylphenylsiloxane) segments in graft copolymers improved thermal stability of PMMA and enhanced the activation energy for thermal degradation of PMMA. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2521–2530, 1998

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Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…13 C-NMR spectra of various graft copolymers (A) PSXE a (20)-g-PMMA18, (B) PSXE a (15)-g-PMMA18, (C) PSXE a (10)-g-PMMA18, and (D) PSXE a (7.5)g-PMMA18.…”

mentioning

confidence: 99%

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Characterization and degradation of the poly(methylphenylsiloxane)-poly(methyl methacrylate) graft copolymer

Chang¹,

Liao²,

Wu³

et al. 1998

J. Polym. Sci. A Polym. Chem.

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“…202 Fractionation by chemical composition of copolymers of methyl methacrylate with an eo-methyl methacryloyl oligodimethylsiloxane produced fractions differing in methyl methacrylate content by up to 24 wt% in good agreement with theoretical predictions. 203 A further complicating feature of macro mer polymerization can be chain transfer to macro mer-derived side-chains which leads to steadily increasing polymer molecular weight as conversion increases. In copolymerizations of butyl acrylate with w-styrenic oligo(ethylene oxide)s the transfer was shown to involve chiefly benzylic hydrogens adjacent to the styryl units from the macromer.…”

Section: Acromersmentioning

confidence: 99%