文献类型：期刊文献

英文题名：The effect of titanium incorporation on the thermal stability of phenol-formaldehyde resin and its carbonization microstructure

作者：Zhang, Yan[1];Shen, Shihong[1];Liu, Yujian[1]

机构：[1]E China Univ Sci & Technol, Key Lab Specially Funct Polymers & Related Techno, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2013

卷号：98

期号：2

起止页码：514

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20130315906404);WOS:【SCI-EXPANDED(收录号:WOS:000315131600006)】；

基金：Financial supports from Shanghai Leading Academic Discipline Project (B502) are greatly appreciated.

语种：英文

外文关键词：Phenolic resin; Titanium; Modified; Thermal stability; Carbonization

摘要：A new titanium modified phenolic resin (Ti-PF) was prepared by using tetraisopropyl titanate, phenol and formaldehyde with mild and friend reaction condition. The structure of the modified resin was demonstrated by means of FT-IR spectra. The titanium modified resin is soluble only in a few solvents such as DMF, DMAc, DMSO, but exhibits poor solubility in most universal solvents. The thermal degradation behavior of the Ti-PF was studied by thermal gravimetric (TG) method. Compared with the unmodified resin (PF), the temperature at the maximum decomposing rate of the Ti-PF increases by 43 degrees C and its charring yield enhances by 11 percent. The carbonized products of PF (C-PF) and Ti-PF (C-Ti-PF) were further investigated by X-ray diffraction and Roman spectroscopy, respectively. The analysis indicates that the incorporation of titanium into carbon lattice results in an increase of crystallite height and decrease of interlayer spacing. Titanium modified PF becomes much more ordered with a d(002) of 0.3572 nm as compared to that of 3.7811 nm for C-PF And the crystal size of C-Ti-PF increases to 4.37 nm, 2.13 nm larger than that of C-PF. In addition, the I-D/I-G value of C-Ti-PF decreases from 2.85 (C-PF) to 2.62. The results prove that the incorporation of titanium exhibited obvious effects on improving thermal stability of the phenolic resin and on promoting its graphite crystallite. (C) 2012 Elsevier Ltd. All rights reserved.