PMID- 36452512
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20221202
IS  - 0141-3910 (Print)
IS  - 1873-2321 (Electronic)
IS  - 0141-3910 (Linking)
VI  - 174
DP  - 2020 Apr
TI  - Micro and macroscopic mechanical behaviors of high-density polyethylene under UV 
      irradiation and temperature.
LID - 10.1016/j.polymdegradstab.2020.109098 [doi]
AB  - The macroscopic mechanical behavior of high-density polyethylene (HDPE) during 
      photodegradation is characterized by decreases of tensile elongation-at-failure. 
      An apparent linear relation between the elongation-at-failure and the molar mass 
      indicates that the decrease of the elongation of HDPE over time is highly 
      dependent on the decrease of the average molar mass. Possible preferential 
      scission of the high molar mass chains was observed for HDPE exposed to 
      ultraviolet (UV) irradiance higher than 40% (61 W/m(2)) of the full intensity at 
      50  degrees C. Tensile modulus of HDPE exposed at 50  degrees C increased with the exposure time 
      until reaching the complete loss of ductility except the 5% UV. For 40% UV/30  degrees C 
      as well as for 5% UV/50  degrees C, the young modulus trend cannot be evaluated with 
      performed (small) duration. Nanomechanical test results suggest that the 
      increased tensile modulus is due to stiffening of the entire cross-section. 
      Furthermore, HDPE showing the complete loss of ductility exhibited significantly 
      higher modulus in the surface regions than the core regions particularly for the 
      UV intensity higher than 40% (61 W/m(2)), which increased crack sensitivity to 
      cause embrittlement of the entire specimens.
FAU - Hsueh, Hsiang-Chun
AU  - Hsueh HC
AD  - Materials and Structural Systems Division, Engineering Laboratory, National 
      Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
FAU - Kim, Jae Hyun
AU  - Kim JH
AD  - Materials and Structural Systems Division, Engineering Laboratory, National 
      Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
FAU - Orski, Sara
AU  - Orski S
AD  - Materials Science and Engineering Division, Materials Measurement Laboratory, 
      National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
FAU - Fairbrother, Andrew
AU  - Fairbrother A
AD  - Materials and Structural Systems Division, Engineering Laboratory, National 
      Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
FAU - Jacobs, Deborah
AU  - Jacobs D
AD  - Materials and Structural Systems Division, Engineering Laboratory, National 
      Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
FAU - Perry, Lakesha
AU  - Perry L
AD  - Materials and Structural Systems Division, Engineering Laboratory, National 
      Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
FAU - Hunston, Donald
AU  - Hunston D
AD  - Materials and Structural Systems Division, Engineering Laboratory, National 
      Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
FAU - White, Christopher
AU  - White C
AD  - Materials and Structural Systems Division, Engineering Laboratory, National 
      Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
FAU - Sung, Lipiin
AU  - Sung L
AD  - Materials and Structural Systems Division, Engineering Laboratory, National 
      Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
LA  - eng
GR  - 9999-NIST/Intramural NIST DOC/United States
PT  - Journal Article
PL  - England
TA  - Polym Degrad Stab
JT  - Polymer degradation and stability
JID - 101248930
PMC - PMC9706683
MID - NIHMS1616311
OTO - NOTNLM
OT  - Accelerated weathering test
OT  - HDPE
OT  - Mechanical property
OT  - Molar mass
OT  - UV
COIS- Declaration of competing interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2020/04/01 00:00
MHDA- 2020/04/01 00:01
PMCR- 2022/11/29
CRDT- 2022/12/01 02:49
PHST- 2022/12/01 02:49 [entrez]
PHST- 2020/04/01 00:00 [pubmed]
PHST- 2020/04/01 00:01 [medline]
PHST- 2022/11/29 00:00 [pmc-release]
AID - 10.1016/j.polymdegradstab.2020.109098 [doi]
PST - ppublish
SO  - Polym Degrad Stab. 2020 Apr;174:10.1016/j.polymdegradstab.2020.109098. doi: 
      10.1016/j.polymdegradstab.2020.109098.