Login In
Citation:
FU Tieyuan, QI Yuchen, WU Suyun, CHEN Donglin. EQUILIBRIUM HEAT OF FUSION OF POLYTETRAFLUOROETHYLENE*[J]. Chinese Journal of Polymer Science,
;1985, 3(4): 324-331.
-
The reliability of the values of equilibrium heat of fusion, △Hm, of polytetrafluoroethylene (PTFE)reported in the literature and the inadequacy of the generally accepted value of 13 .7 or 14.6 cal/gwere discussed. Through extrapolating linear plot of △Hm vs. Vsp of the thermally aged PTFE virginas-polymerized samples prepared in accord with ASTM D 1457-81a, △Hmo=79.6J/g (19.0 cal/g)and Vsp (specific volume of amorphous PTFE at 23℃)=0.480 cm3/g (or ρa=2 .08g/cm3) were ob-tained. The heats of fusion,△Hm,of the thermally aged and γ-irradiated samples are different irrespective of the same Vsp value for both samples.A qualitative explanation of this phenomenon was given based on the HV patterns of SALS and Kawai's model.
-
-
-
-
[1]
Kun Zhang , Ni Dan , Dan-Dan Ren , Ruo-Yu Zhang , Xiaoyan Lu , Ya-Pan Wu , Li-Lei Zhang , Hong-Ru Fu , Dong-Sheng Li . A small D-A molecule with highly heat-resisting room temperature phosphorescence for white emission and anti-counterfeiting. Chinese Journal of Structural Chemistry, 2024, 43(3): 100244-100244. doi: 10.1016/j.cjsc.2024.100244
-
[2]
Tingting Liu , Pengfei Sun , Wei Zhao , Yingshuang Li , Lujun Cheng , Jiahai Fan , Xiaohui Bi , Xiaoping Dong . Magnesium doping to improve the light to heat conversion of OMS-2 for formaldehyde oxidation under visible light irradiation. Chinese Chemical Letters, 2024, 35(4): 108813-. doi: 10.1016/j.cclet.2023.108813
-
[3]
Rongliang Deng , Yihang Chen , Xiaotong Fan , Guolong Chen , Shuli Wang , Changzhi Yu , Xiao Yang , Tingzhu Wu , Zhong Chen , Yue Lin . Break of thermal equilibrium between optical and acoustic phonon branches of CsPbI3 under continuous-wave light excitation and cryogenic temperature. Chinese Chemical Letters, 2024, 35(7): 109346-. doi: 10.1016/j.cclet.2023.109346
-
[1]
Metrics
- PDF Downloads(0)
- Abstract views(453)
- HTML views(21)
DownLoad: