Determination of carboxyl content in carboxylated nitrile butadiene rubber (XNBR) after degradation via olefin cross metathesis |
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| Institution: | 1. State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry, Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China;2. Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina Company Limited, Lanzhou 730060, China;1. Materials Science Division, Naval Physical and Oceanographic Laboratory (DRDO), Thrikkakara, Kochi 682 021, Kerala, India;2. Rubber Technology Centre, Indian Institute of Technology, Kharagpur, West Bengal, India;1. Univ. Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France;2. CNRS, LCPO, UMR 5629, F-33600 Pessac, France;1. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan;2. Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;3. Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;4. Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan;1. University of Rennes 1, CNRS, Institut des Sciences Chimiques de Rennes (ISCR), UMR 6226, F-35042 Rennes Cedex, France;2. BOSTIK S.A., F-93211 La Plaine Saint-Denis, France;3. BOSTIK S.A., F-60280 Venette, France;4. Total S.A., Corporate Science, F-92069 Paris La Défense Cedex, France |
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| Abstract: | Carboxyl content in nitrile butadiene rubber (XNBR) has an impact on its application performance. However, its poor solubility makes it difficult to determine the carboxyl content in XNBR due to its high molecular weight. In the present work, olefin cross metathesis was used to degrade XNBR with acrylonitrile (AN) as chain transfer agent for the first time, to solve the solubility problem. After degradation under the optimized condition, with 2% AN and 0.2% catalyst at 60 °C for 30 min, the weight-average molecular weight (Mw) of the product decreased to 0.98 × 104 with distribution (Mw/Mn) of 3.83. Such product was easy to be dissolved, so the carboxyl content in XNBR could be determined with the routine titrimetric analysis methods. |
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| Keywords: | Carboxylated nitrile butadiene rubber Carboxyl content Degradation Olefin cross metathesis |
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