400 and 750 MHz one- and two-dimensional nuclear magnetic resonance spectra of X-ray-degraded poly(methyl methacrylate). Comparison with UV-degraded material.

被引：1

作者：

Waali, EE ^{[1
]}

Scott, JD ^{[1
]}

Vladimirsky, O ^{[1
]}

Vladimirsky, Y ^{[1
]}

Hayataka, KM ^{[1
]}

Klopf, JM ^{[1
]}

机构：

[1] Univ Montana, Dept Chem, Missoula, MT 59812 USA

来源：

EMERGING LITHOGRAPHIC TECHNOLOGIES II | 1998年 / 3331卷

关键词：

poly(methyl methacrylate); PMMA; x-ray; ultraviolet; degradation; chain-scission; nuclear magnetic resonance; NMR;

D O I：

10.1117/12.309609

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Nuclear magnetic resonance spectroscopy (NMR) has been used for the identification of several products from syndiotactic-rich poly(methyl methacrylate) (PMMA) sheet exposed to x-ray and ultraviolet irradiation. Two chain-scission products and two chain-intact products were observed using one and two-dimensional NMR spectroscopy. The 750 and 400 MHz one-dimensional hydrogen(H-1)spectrum and the two-dimensional H-1,H-1-OSY, (1)HMQC, (1) and HMBC1 spectra permitted the assignment of many hydrogen and carbon NMR signals for the four products which are still polymeric. Additional signals were observed for minor stereoisomers. Methyl formate, a small molecular product, was found in both the x-ray and UV degradations. Acetaldehyde was also observed from x-ray exposure but not UV exposure. Important results from this work are well-resolved chemical "fingerprints" for x-ray and UV exposed PMMA.

引用

页码：518 / 524

页数：7