期刊
RSC ADVANCES
卷 12, 期 9, 页码 5349-5356出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra08423b
关键词
-
资金
- Science and Technology Department of Jilin Province [20200703022ZP]
This study aims to determine the conditions for high precision measurement of linear low density polyethylene (LLDPE). Nonuniform sampling (NUS) and band-selective HSQC are evaluated as time-saving strategies. The combination of band-selective HSQC and 50% NUS achieves significant precision enhancements and reduces experiment times.
Two dimensional (2D) H-1-C-13 heteronuclear single-quantum correlation (HSQC) spectroscopy has recently been proposed for quantitative determination of typical linear low density polyethylene (LLDPE) with high accuracy. It requires highly precise measurement to achieve further reliable quantification. In this context, this paper aims at determining conditions that allow the achievement of high precision. On the basis of the optimized parameters, two time-saving strategies, nonuniform sampling (NUS) and band-selective HSQC are evaluated on model polyolefins in terms of repeatability. Precision better than 0.3% and 5% for ethylene content (E mol%) and 1-hexene content (H mol%) of the model poly(ethylene-co-1-hexene)s are obtained with 50% NUS or band-selective HSQC. Moreover, dramatic precision enhancements can be achieved with the combination of band-selective HSQC and 50% NUS, in which repeatabilities better than 0.15% and 2.5% for E mol% and H mol% are observed. The experiment times are reduced to about 0.5 h. These methods open important perspectives for rapid, precise and accurate quantitative analysis of complex polymers.
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