首页>
外国专利>
Linear perfluoropolyethers having an improved thermooxidative stability
Linear perfluoropolyethers having an improved thermooxidative stability
展开▼
机译：具有改善的热氧化稳定性的线性全氟聚醚
展开▼
页面导航
摘要
著录项
相似文献
摘要
Linear perfluoropolyethers of formula:T-O(CF2O)n(CF2CF2O)m(CF2CF2CF2O)r(CF2CF2CF2CF2O)s-T1 (I)wherein n, m, r, s are integers such that the polymer number average molecular weight is comprised between 700 and 100,000 and the n/(n+m+r+s) ratio ranges from 0.05 to 0.40, and respective preparation process by addition of a peroxidic perfluoropolyether of formula (III):T4—O(CF2O)n′(CF2CF2O)m′(O)h-T5 (III)having a PO from 1.8 to 4, to a perfluoropolyether oil preheated at a temperature comprised between 150° C. and 250° C. and subsequent exhaustive fluorination of the obtained compound.
展开▼
机译：式的线性全氟聚醚：<？in-line-formulae description =“ In-line Formulae” end =“ lead”？> TO（CF 2 O） n （CF 2 < / Sub> CF 2 O） m （CF 2 CF 2 CF 2 O） r （CF 2 CF 2 CF 2 CF 2 O）< Sub> s -T 1 （I）<？in-line-formulae description =“ In-line Formulae” end =“ tail”？>其中n，m，r，s是整数，使得聚合物数均分子量在700至100,000之间，并且n /（n + m + r + s）比在0.05至0.40的范围内，并且各自的制备方法通过添加式（III）的过氧化物全氟聚醚的通式：<？in-line-formulae description =“在线公式” end =“ lead”？> T 4 -O（CF 2 O） n' （CF 2 CF 2 O） m′（O） h -T 5 （III）<？in-line-formulae description =“在线表达式” end =“ tail”？>将具有1.8至4的PO的PO 2转化为在150℃至250℃之间的温度下预热的全氟聚醚油，随后将所得化合物彻底氟化。
展开▼
