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Authors Khonakdar, H. A. ; Morshedian, J. ; Wagenknecht, U. ; Jafari, S.H.
Title An investigation of chemical crosslinking effect on properties of high-density polyethylene
Date 21.10.2003
Number 11262
Abstract High-density polyethylene (HDPE) was chemically crosslinked with various amounts of di-<i>tert</i> butyl cumyl peroxide (BCUP). Crosslink density determined by rubber elasticity theory using hot set test showed an increase with increasing BCUP. Glass transition temperature (<i>T</i><sub>g</sub>), thermal stability, crystallization, melting behavior and tensile properties were studied. The results showed a new finding about decrease in <i>T</i><sub>g</sub> as a consequence of the &#x2018;chemical crosslinking&#x2019; of HDPE. This was explained by observed reduction in crystallinity and expected increase in free volume as a result of restriction in chain packing. However, chemical crosslinking had no significant effect on the thermal st<br />ability. The stress at break, Young's modulus yield strength and elongation at break generally decreased with increase in BCUP. By increasing the temperature for slightly crosslinked HDPE, the elongation at break was increased but by increasing the crosslinking level an opposite effect was observed. Crosslinked HDPE showed an decrease in creep strain and an increase in creep modulus with increasing BCUP.
Publisher Polymer
Wikidata
Citation Polymer 44 (2003) 4301-4309
DOI https://doi.org/10.1016/S0032-3861(03)00363-X
Tags high-density polyethylene crosslinking thermal-mechanical properties mechanical-properties blends radiation

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