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Influence of talc fillers on bimodal polyethylene composites for ground heat exchangers
Author(s) -
Kalantar Mehrjerdi Adib,
Åkesson Dan,
Skrifvars Mikael
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49290
Subject(s) - talc , materials science , high density polyethylene , composite material , thermogravimetric analysis , polyethylene , dynamic mechanical analysis , differential scanning calorimetry , ultimate tensile strength , crystallization , polymer , chemistry , physics , organic chemistry , thermodynamics
In this study, a commercial grade of talc is used as filler in a bimodal high‐density polyethylene (HDPE) used for the pressure pipe application. The composites are characterized by thermogravimetric analysis (TGA), differential scanning calorimetry, dynamic mechanical thermal analysis, and tensile testing. The results illustrate that the presence of talc has a considerable effect on the material properties and the pipe life‐length. It is presented that the thermal stability measured by TGA is enhanced, while the oxidation induction time decreases in cooperation of the talc. The nucleation behavior of talc particles during crystallization has no obvious effect on melting temperature; however, an increase in crystallization temperature is evidenced. Storage modulus as recorded from the dynamic mechanical analysis is also increased in all composites, furthermore, the temperature of the α relaxation is shifted toward higher temperature and finally the strain hardening modulus for the HDPE/talc composites is assessed and compared to the neat HDPE as a measure of environmental stress crack resistance.