Journal
POLYMER
Volume 218, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2021.123485
Keywords
Crystallization and melting behaviors; Small-angle X-ray scattering; Polyethylene
Categories
Funding
- National Natural Science Foundation of China [1903013, 51525305]
- Scientific Research Funds of Huaqiao University
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The study investigates the structural evolution and temperature dependence of crystal thickness in high-density polyethylene (HDPE) under different crystallization methods. It was found that stretched HDPE processed much thinner crystalline lamellae, while samples crystallized isothermally exhibited better stability.
The structural evolution and temperature dependence of crystal thickness in high-density polyethylene (HDPE) generated from quasi-isothermal and stress-induced localized melts were studied by employing small-angle X-ray scattering and differential scanning calorimetry techniques. By analyzing the relationship between the reciprocal lamellar thickness and crystallization temperature, two well-defined crystallization lines with similar slopes were obtained, implying an organization of molten chain segments into crystallites passing through a mesomorphic phase. However, two different equilibrium crystallization temperatures were yielded. Furthermore, two recrystallization lines were ascertained for both stretched and isothermal crystallized HDPE samples. These phenomena are mainly caused by the differences between the thermodynamic parameters of polymer chains and crystal stabilities. Specifically, HDPE upon stretching processed much thinner crystalline lamellae, while the sample during isothermal crystallization exhibited better stability due to the high internal mobility of the polymeric chain segments and global flexible surroundings. Moreover, neither melting line coincided with their crystallization lines, which confirmed that these two processes are irreversible.
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