| POLYMERS AND POLYMER MATRIX COMPOSITES |
|
|
|
|
|
| Impact of Isocyanate Index on Flame Retardancy, Thermal Stability andCombustion Behaviors of Rigid Polyurethane Foam |
| LIU Hongyin1,2, YANG Hongyu1,2, CHEN Mingfeng2
|
1 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044
2 College of Materials Science and Engineering, Chongqing University, Chongqing 400044 |
|
|
|
|
Abstract Aiming at comparatively investigating the impact of isocyanate index (NCO) on flame retardancy, thermal stability and combustion behaviors of rigid polyurethane foam (RPUF) with and without the addition of common flame retardants, a serious of RPUF, rigid polyurethane foam/expandable graphite (RPUF/EG) and rigid polyurethane foam/ammonium polyphosphate (RPUF/APP) samples with different NCO (1.5 and 3) were prepared. The flame retardancy, thermal degradation and combustion behaviors of each sample were investigated. The limit oxygen index (LOI) results indicated that increasing isocyanate index was beneficial to the flame retardancy of all foam systems, specially the LOI data of RPUF/EG presented a substantial growth from 29.5% to 33.5% with the increasing NCO. The results of thermogravimetric analysis (TGA) showed that the increase of NCO can improve the initial decomposition temperature and carbon residue in all samples effectively. The data obtained from cone calorimeter (Cone) revealed that the increase of NCO can significantly reduce the heat release rate (HRR) of RPUF and RPUF/EG. And the rate of mass loss was slowed down, carbon residue increased with the rise of NCO. The findings in this study demonstrated that isocyanate index played an important role in flame retardancy, thermal degradation and combustion behaviors of RPUF, which must be paid more attention to the studies of flame-retardant RPUF.
|
|
Published: 31 May 2019
|
|
|
| Fund:This work was financially supported by the Opening Fund of State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University (2011DA105287-FW201608), the National Natural Science Foundation of China (51603025), the Fundamental Research Funds for the Central Universities, Chongqing University (106112016CDJXY130004, 0903005203302). |
| About author:: Hongyin Liu,master candidate, currently study in Chongqing University, Her research interests are new technology of flame retardant for polymer, fire-resistant materials.Hongyu Yangreceived his Ph.D. degree from University of Science and Technology of China in 2015. He is currently a lecturer in College of Materials Science and Engineering, Chongqing University. His research inte-rests are new technology of flame retardant for polymer, fire-resistant materials, chemical building materials and the synthesis of concrete admixture. |
|
|
1 Chattopadhyay D K, Webster D C. Progress in Polymer Science, 2009,4(10),1068.
2 Paabo M, Levin B C. Fire and Materials, 1987,11(1),1.
3 Zhang X, Wang G, Liu D, et al. In: Progress in Renewable and Sustai-nable Energy. Jilin, 2013, pp.1783.
4 Hu X M, Wang D M. Journal of Applied Polymer Science, 2013,129(1),238.
5 Yuan Y, Yang H, Yu B, et al. Industrial & Engineering Chemistry Research, 2016,55(41),10813.
6 Yang H, Wang X, Song L, et al. Polymers For Advanced Technologies, 2014,25(9),1034.
7 Singh H, Jain A K, Sharma T P. Journal of Applied Polymer Science, 2008,109(4),2718.
8 Thirumal M, Khastgir D, Nando G B, et al. Polymer Degradation and Stability, 2010,95(6),1138.
9 Zatorski W, Brzozowski Z K, Kolbrecki A. Polymer Degradation and Stability, 2008,93(11),2071.
10Xing W, Yuan H, Zhang P, et al.Journal of Polymer Research, 2013,20(9),234.
11Peng T, Liu B, Gao X, et al. Applied Surface Science, 2018,444,800.
12Luo W, Li Y, Zou H, et al.RSC Advances, 2014,4(70),37302.
13Shi L, Li Z M, Xie B H, et al. Polymer International, 2006,55(8),862.
14Bian X C, Tang J H, Li Z M. Journal of Applied Polymer Science, 2008,110(6),3871.
15Liu D Y, Zhao B, Wang J S, et al.Journal of Applied Polymer Science, 2018,135(27),46434.
16Verdolotti L, Oliviero M, Lavorgna M, et al. Polymer Degradation and Stability, 2016,134,115.
17Wang C, Wu Y, Li Y, et al. Polymers for Advanced Technologies, 2018,29(1),668.
18Chen Y, Li L, Xu L, et al. Journal of Applied Polymer Science, 2018,135(22),46334.
19Meng X Y, Ye L, Zhang X G, et al. Journal of Applied Polymer Science, 2009,114(2),853.
20Chattopadhyay D K, Sreedhar B, Raju K. Polymer,2006,47(11),3814.
21Levchik S V, Weill E D. Polymer International, 2004,53(11),1585. |
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
2019, Vol. 33 
