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- W2007060306 abstract "The three thermal properties that describe the heat transfer in a material were determined for a thin, tough, transparent, highly crystalline film of poly-monochloro-para-xylylene (PCPX). These three properties, viz. thermal conductivity (K), thermal diffusivity (α), and specific heat (Cp) were determined using a transient heating method. The experimental method used involved the heating of a sample of stacked polymer sheets by an ultrathin heating foil. The heating foil, located in the center plane of the stack provided a source of constant heat flux when a current of known amperage was passed through it. By careful consideration of sample dimensions, the sample simulated an infinite solid. The thermal properties were calculated using standard solutions of the heat transfer equations of an infinite solid over a temperature range of −192 to 130°C. The experimental method was repeated to check the reproducibility of the results and compared with differential scanning calorimeter results. A data acquisition system was developed to facilitate data handling for the transient experiments. The system included hardware capable of punching data on paper tape and a software package to analyze these data. The conclusions drawn include: (1) the reproducibility of the experiments was well within the experimental errors; (2) the data acquisition system greatly facilitates acquisition of thermal data; (3) an incremental change occurs in Cp of PCPX in the vicinity of the γ relaxation reported by dynamical relaxation measurements and its occurrence indicates that this relaxation involves a cooperative motion of molecules; (4) owing to the significant magnitude of the Cp jump and the appreciable degree of crystallinity of PCPX, these internal motions occurring at the γ transition probably involve both amorphous and crystalline regions; (5) a direct relationship between thermal expansion and specific heat was indicated in PCPX as well as for polystyrene (PS) at relatively low temperatures (−200 to −20°C); (6) the overall low values of thermal conductivity (1.0 to 2.5 × 10−4 cal sec−1 cm−1) and thermal diffusivity (9.5 to 5.3 × 10−4 cm2 sec−1) of PCPX indicate that it is ideally suited for insulation applications." @default.
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- W2007060306 date "1974-06-01" @default.
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- W2007060306 title "The thermal properties of monochloro-para-xylylene" @default.
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- W2007060306 doi "https://doi.org/10.1016/0040-6031(74)85010-0" @default.
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