Analyzing the effects of thermal stress on insulator papers by solid-state 13C NMR spectroscopy
نویسندگان
چکیده
Abstract Million tons of cellulosic paper have been used for insulating coils in oil-filled electrical power transformers, thereby assuring the electricity supply our societies. The high working temperatures transformers constantly degrade insulators throughout their service life up to 40 years. We approached structural changes oil-immersed samples upon thermal stress a study that compared unbleached softwood Kraft as insulator with pure cotton cellulose paper. model experiments treatment transformer oil at 170 °C 14 days. were characterized by means 13 C CP/MAS NMR spectroscopy, mainly based on deconvolution C4 resonance. An automated, fast, and reproducible resonance employing “Peak Analyzer” tool OriginPro 2020 (OriginLab Corporation, USA) was developed exploit spectroscopy characterization thermally stressed samples. Our results show induced depend heavily composition paper, hornification coalescence fibrils take place, allomorph crystallites is altered under given conditions. Graphical abstract
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ژورنال
عنوان ژورنال: Cellulose
سال: 2021
ISSN: ['1572-882X', '0969-0239']
DOI: https://doi.org/10.1007/s10570-021-04338-z