1995
DOI: 10.1021/ma00128a026
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Cross-Polarization Magic-Angle Spinning 13C Nuclear Magnetic Resonance Study of the Homogeneity of Some Photopolymerized Acrylic Networks

Abstract: A theoretical analysis of relaxation processes has been used in the qualitative interpretation of carbon-resolved, proton Tlp data obtained at 100.56 MHz for three solid polyacrylate networks made by photopolymerization of the polyol acrylate monomers poly(ethylene glycol) diacrylate (PEGA), trimethylolpropane triacrylate (TMPTA), and dipentaerythritol pentaacrylate (DPHPA). This analysis permits an estimate of the spin diffusion rates between different chemical species. Such rates are strongly dependent on sp… Show more

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Cited by 13 publications
(22 citation statements)
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“…18 As we previously reported, these values are strongly dependent on the homogeneity of the networks. 18 Closer values imply a more homogeneous network with the compounds in closer, more intimate contact.…”
Section: Resultsmentioning
confidence: 66%
See 2 more Smart Citations
“…18 As we previously reported, these values are strongly dependent on the homogeneity of the networks. 18 Closer values imply a more homogeneous network with the compounds in closer, more intimate contact.…”
Section: Resultsmentioning
confidence: 66%
“…18 As we previously reported, these values are strongly dependent on the homogeneity of the networks. 18 Closer values imply a more homogeneous network with the compounds in closer, more intimate contact. A clear phase separation has been reported previously as occurring in a polymer formed by the photopolymerization of a mixture of the triacrylate TMPTA, the pentacrylate DPHPA, and the long chain poly(ethylene glycol diacrylate) PEGA 400.…”
Section: Resultsmentioning
confidence: 66%
See 1 more Smart Citation
“…However, it is not an easy task to analyze cured resins even using advanced spectroscopic method such as high-resolution NMR due to their insoluble nature. Although solid-state NMR has been successfully utilized to study the heterogeneity of network structures in photo-cured resins, 4,5 this technique is not necessarily suitable for characterizing microstructures in the rigidly cross-linked resins mainly because of insufficient resolution.…”
Section: Introductionmentioning
confidence: 99%
“…However, it is not an easy task to analyze cross-linked UV-cured resins even using advanced spectroscopic method such as high-resolution NMR because of their insoluble nature. Although solid-state NMR has been successfully utilized to study the heterogeneity of network structures in photo-cured resins [4,5], this technique is not necessarily suitable for practical applications mainly because of insufficient resolution. On the other hand, Haken et al attempted to characterize cross-linked dimethacrylates of bisphenol A diglycidyl ethers by gas and liquid chromatography combined with off-line acid and alkali fusion.…”
Section: Introductionmentioning
confidence: 99%