文献类型：期刊文献

英文题名：Chemical modification of organosolv lignin using boronic acid-containing reagents

作者：Korich, Andrew L.[5] Fleming, Andrew B.[1] Walker, Amanda R.[1] Wang, Jifu[2,3,4] Tang, Chuanbing[2,3] Iovine, Peter M.[1]

第一作者：Korich, Andrew L.

通信作者：Iovine, PM[1]

机构：[1]Univ San Diego, Dept Chem & Biochem, San Diego, CA 92110 USA;[2]Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA;[3]Univ S Carolina, Nanoctr, Columbia, SC 29208 USA;[4]Chinese Acad Forestry, Inst Chem Ind Forestry Prod, Nanjing 21042, Jiangsu, Peoples R China;[5]Grand Valley State Univ, Dept Chem, Allendale, MI 49401 USA

年份：2012

卷号：53

期号：1

起止页码：87-93

外文期刊名：POLYMER

收录：;EI(收录号：20120114654406);Scopus(收录号：2-s2.0-84655164930);WOS:【SCI-EXPANDED(收录号:WOS:000300073600009)】；

语种：英文

外文关键词：Biopolymers; Graft copolymers; Star polymers

摘要：Organosolv lignin was chemically modified with boron-containing reagents using a novel "graft-to" approach. The newly synthesized graft copolymers were prepared by covalently linking boron end-functionalized polycaprolactone (PCL) macromolecular reagents with organosolv lignin via reversible covalent bonds. Using a combination of H-1, C-13, F-19, and B-11 NMR, it has been shown that arylboronate ester bonds are involved in the key linkages between the polyester grafts and the lignin core. Using a straightforward synthetic procedure and altering both the PCL graft density and the PCL molecular weight, a selection of compositions were studied. The newly prepared lignin-g-PCL copolymers were analyzed by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). The Lignin-PCL5200 series shows an increase in PCL crystallinity with an increase PCL graft density. However, the crystallinity of the PCL in the lignin-g-PCL9100 set of materials remained constant throughout the series. TGA analysis for all lignin-g-PCL copolymers prepared herein show thermal decomposition near 300 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.