Heat capacities of polyethylene from 2 to 360 K. II. Two high density linear polyethylene samples and thermodynamic properties of crystalline linear polyethylene
Open accessAbstract
Heat capaci ties of two high density linear polyethylene sa mples were meas ured from 2 to 360 K.By incorporating th e res ults from the previous work of this serie s, thermodynamic properties of compl e tely crystalline lin ea r polyethylene may be estimated.Cp , H -Ho, Sand -(G -Ho) at 298.15 K for crystalline lin ea r polyethylene are estimated to be 22.60 J K-' mol -I, 3544 J mol -I, 23.02 J K-' mol -' and 3319 J mol -I, respectively.Spo ntaneous adiabatic temperature drifts were obse rved in both sa mpl es near 240 K.These drifts may be attributed to the enthalpy re laxation ph enome na occ urrin g in the glass tran sformation region.
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The contribution of 1 wt% Au nanoparticles to the total heat capacity of the sample is negligible.
“Although our samples contained Au nanoparticles, we here note that the heat capacities of gold on a mass basis are smaller by a factor of 4–10 compared to that of the PE (at 300 K, 0.13 in ref. 79 vs. 1.75 J g−1 K−1 in ref. 61). The contribution of 1 wt% of the Au to the total heat capacity in our sample will therefore be negligible.”
From Origin of high thermal conductivity in disentangled ultra-high molecular weight polyethylene films: ballistic phonons within enlarged crystals (2022) · cites this paper as [61]
Table 2 reports polyethylene heat capacities near 300 K of about 25 J mol−1 K−1, consistent with the citing sentence’s mass-based PE value. The paper does not address Au nanoparticles or their 1 wt% contribution; the negligible-contribution conclusion is the citing authors’ inference using a separately cited gold value. (LLM, conf=0.85)
Experimental — accuracy not yet measuredHeat capacities from ref. 61 were used for the analysis.
“Therefore, heat capacities from ref. 61 were used.”
From Origin of high thermal conductivity in disentangled ultra-high molecular weight polyethylene films: ballistic phonons within enlarged crystals (2022) · cites this paper as [61]
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Research works printed but not linked: 22
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Kim, T., Drakopoulos, S. X., Ronca, S., & Minnich, A. J. (2022) · Nature Communications · doi:10.1038/s41467-022-29904-2 · Cited by 63 · see citing works
- Authors
- Chang, S. S.
- Affiliations
- National Institute of Standards and Technology (US)
- Corresponding author
- Chang, S.S.
- Venue
- Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
- Published
- 1974-05
- Volume
- 78A
- Issue
- 3
- Pages
- 387
- ISSN
- 0022-4332 (ISSN-L)
- PMC
- PMC6742827
- OpenAlex
- W2323629670
- Cited by
- 41
- References
- 0
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 1 · 2020: 1 · 2017: 1 · 2016: 1 · 2015: 2
- FWCI
- 3.89
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Research of the National Bureau of Standards Section A Physics and Chemistry (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Organic Chemistry › Chemical Thermodynamics and Molecular Structure
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Materials Chemistry › Material Dynamics and Properties
- Keywords
- polyethylene, heat capacity, high-density polyethylene, crystalline polyethylene, thermodynamic properties, enthalpy, entropy, enthalpy relaxation, glass transition, low temperature
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