文献类型：期刊文献

英文题名：Preparation and characterization of flame retardant polyurethane foams containing phosphorus-nitrogen-functionalized lignin

作者：Zhu, Haibin[1] Peng, Zumao[1] Chen, Yongmei[1] Li, Gaiyun[2] Wang, Lei[1] Tang, Yang[1] Pang, Ran[1] Khan, Zia Ul Haq[1] Wan, Pingyu[1]

第一作者：Zhu, Haibin

通信作者：Chen, YM[1]

机构：[1]Beijing Univ Chem Technol, Natl Fundamental Res Lab New Hazardous Chem Asses, Beijing Key Lab Environm Harmful Chem Anal, Beijing 100029, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, SFA, Key Lab Wood Sci & Technol, Beijing 100091, Peoples R China

年份：2014

卷号：4

期号：98

起止页码：55271-55279

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20144600191442);Scopus(收录号：2-s2.0-84908701285);WOS:【SCI-EXPANDED(收录号:WOS:000344989800044)】；

基金：The authors greatly appreciate the support from the national natural science foundation of China (no. 51374016) and Chinese universities scientific Fund (no. JD1313). The authors thank Prof. Xiaoguang Liu and Prof. Sheng Zhang for valuable suggestions in the preparation of this manuscript.

语种：英文

外文关键词：Aromatic compounds - Nitrogen - Phosphorus - Smoke

摘要：Lignin, a natural macromolecule containing substantial aromatic rings and abundant hydroxyl groups, was firstly chemically grafted with phosphorus-nitrogen-containing groups via a liquefaction-esterification-salification process to prepare lignin-based phosphate melamine compound (LPMC). And then the LPMC which has remaining hydroxyl groups was used to substitute parts of polyols and copolymerize with isocyanate to produce lignin-modified-PU foam (PU-LPMC) with excellent flame retardancy. Owing to the rigid aromatic structure of lignin and the covalent linkages between LPMC and the polymer-matrix, PU-LPMC showed a nearly 2-fold increase in compression strength and excellent performance of thermal stability, char residue formation, self-extinguishment and inhibition from melt-dripping and smoke generation. Moreover, a large amount of non-flammable gases were released during thermal degradation and a compact and dense intumescent (C-P-N-O)(x) char layer formed on the surface of the foams after combustion, resulting in the improvement of anti-flaming properties of the polymer by the flame retardancy of both gas phase and condensed phase.