Splitstone Paul L, Johnson Walter H
Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.
J Res Natl Bur Stand A Phys Chem. 1974 Sep-Oct;78A(5):611-616. doi: 10.6028/jres.078A.038.
The enthalpies of combustion and formation of two samples of linear polyethylene which differ only in the degree of crystallinity have been determined in an oxygen bomb calorimeter. For the two samples the degree of crystallinity, the enthalpy of combustion at 298.15 K, and the enthalpy of formation at 298.15 K, were respectively: 72 percent, -651.16 ± 0.12 kJ · mol, -28.18 ± 0.13 kJ · mol for the less crystalline sample; and 96 percent, -650.27 ± 0.12 kJ · mol and -29.08 ± 0.12 kJ · mol for the more crystalline sample. The values are per mole of CH. Uncertainties listed are estimates of accuracy of approximate 95 percent confidence limits. The results of previous determinations by other investigators are discussed briefly.
在氧弹量热计中测定了两个仅结晶度不同的线性聚乙烯样品的燃烧焓和生成焓。对于这两个样品，其结晶度、298.15K时的燃烧焓以及298.15K时的生成焓分别为：结晶度较低的样品，72%、-651.16±0.12kJ·mol、-28.18±0.13kJ·mol；结晶度较高的样品，96%、-650.27±0.12kJ·mol和-29.08±0.12kJ·mol。这些值是每摩尔CH的值。列出的不确定度是约95%置信限准确度的估计值。简要讨论了其他研究者先前测定的结果。
