PHENOL-FORMALDEHYDE RESIN CURING AND BONDING IN STEAM-INJECTION PRESSING .2. DIFFERENCES BETWEEN RATES OF CHEMICAL AND MECHANICAL RESPONSES TO RESIN CURE

被引:19
作者
CHRISTIANSEN, AW [1 ]
FOLLENSBEE, RA [1 ]
GEIMER, RL [1 ]
KOUTSKY, JA [1 ]
MYERS, GE [1 ]
机构
[1] UNIV WISCONSIN,DEPT CHEM ENGN,MADISON,WI 53706
关键词
PHENOL-FORMALDEHYDE; RESIN; CURE RATE; DYNAMIC MECHANICAL ANALYSIS; DIFFERENTIAL SCANNING; CALORIMETRY; MECHANICAL CURE; CHEMICAL CURE;
D O I
10.1515/hfsg.1993.47.1.76
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) were applied to samples of phenol-formaldehyde resole resins that had been previously exposed to dry precure conditions. The area under tan delta curves during DMA isothermal scans of such samples decreased as the degree of precure increased; this area was used as an empirical measure of the rate of mechanical cure for phenolic resins. Similarly, the DSC exotherm area decreased with greater sample precure; this area was used to measure the rate of chemical cure. Rates of mechanical and chemical cure differed for different resins and with temperature. Under dry precure conditions at 115-degrees and 140-degrees-C, a high degree of mechanical cure was achieved at a low degree of chemical cure.
引用
收藏
页码:76 / 82
页数:7
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