1995
DOI: 10.1021/ma00114a023
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Investigation of High-Temperature Radiation Effects on Poly(methyl methacrylate) of Specific Tacticity

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Cited by 16 publications
(6 citation statements)
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“…For PBMA, analysis of the upfield signals for alkans in the spectra was unsuccessful because of the formation of various degradation products with different tacticities 23. Most of new peaks in the downfield, particularly in the 1 H‐NMR spectrum, could be assigned on the basis of the data for PMMA degraded thermally or on electromagnetic irradiations 3–5, 24. The assigned structures are indicated in the figures and a most likely mechanism for the degradation of PBMA based on these results is shown in Figure 5.…”
Section: Resultsmentioning
confidence: 99%
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“…For PBMA, analysis of the upfield signals for alkans in the spectra was unsuccessful because of the formation of various degradation products with different tacticities 23. Most of new peaks in the downfield, particularly in the 1 H‐NMR spectrum, could be assigned on the basis of the data for PMMA degraded thermally or on electromagnetic irradiations 3–5, 24. The assigned structures are indicated in the figures and a most likely mechanism for the degradation of PBMA based on these results is shown in Figure 5.…”
Section: Resultsmentioning
confidence: 99%
“…Poly(alkyl methacrylate)s are known to have a good resistance to sunlight but to undergo chain scissions when subjected to high‐energy irradiations such as γ‐, X‐, and vacuum UV rays and electron beams3–7 or to long‐time UV irradiation 8–12. In the latter cases, the degradation occurs randomly over the whole polymer chains.…”
Section: Introductionmentioning
confidence: 99%
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“…11, there is the emergence of several small peaks as the dose is increased. The signals in the 4.3 -5.0 ppm range can be attributed to unsaturation of the polymer chain ends and backbone and the formation of dimethoxy methane (-CH 2 -group) [64]. The signals at 6.1 and 5.5 ppm are indicative of the presence of monomer in the sample [2,66], as previously stated.…”
Section: Nmrmentioning
confidence: 56%
“…10 and 11 show the 1 H NMR spectra for PMMA. The signals in the 0.7 -1.2 ppm range indicate the polymer sample is highly syndiotactic, as the dominant signal in the 0.7 -0.8 ppm range corresponds to the syndiotactic content of the polymer, the signal in the 0.9 -1.0 ppm range corresponds to the atactic content of the polymer, and the signal in the 1.1 ppm range corresponds to the isotactic content of the polymer [64]. These signals can be assigned to the a-methyl hydrogens, and the lack of change in their peak height ratios indicates there was no significant change in tacticity.…”
Section: Nmrmentioning
confidence: 99%