Functionalization of polyethylene and ethylene propylene diene terpolymer in the bulk through dibutyl maleate grafting

Abstract

Functionalization of polyethylene (PE) and ethylene propylene diene terpolymer (EPDM) in the bulk through dicumyl peroxide (DCP) initiated grafting of dibutyl maleate (DBM) has been studied in the temperature range from 140 to 200°C. The degree of grafting has been determined by infrared spectrophotometry and DSC. The concentration of DBM and DCP has been optimized. 0.5 wt.-% and 0.2 wt.-% DCP for PE and EPDM, respectively, and 10% DBM for both have been found to be the optimum. The kinetics of the grafting reaction is comparable for PE and EPDM. The activation energy of grafting is ca. 145 kJ/mol for PE and ca. 130 kJ/mol for EPDM. The influence of structure of polyolefins on the degree of grafting has also been studied. A higher degree of grafting is obtained for PE than for EPDM. For PE/EPDM blends, the degree of grafting increases with increasing PE content in the blends. A thorough discussion and proposed mechanism for grafting and other competitive secondary reactions has been provided. ZUSAMMENFASSUNG: PE und EPDM-Kautschuk wurden durch Aufpfropfen von Dibutylmaleat (DBM) mit Dicumylperoxid (DCP) als Initiator in Substanz im Temperaturbereich von 140-220 "C funktionalisiert. Der Pfropfungsgrad wurde IR-spektroskopisch und durch DSC-Messungen ermittelt. Die fur die Pfropfung optimalen DBM-und DCP-Konzentrationen betragen 0,5 bzw. 0,2 Gew.-To. Die Kinetik der Pfropfreaktion ist fur PE und EPDM vergleichbar; die Aktivierungsenergien betragen ca. 145 bzw. 130 kJ/mol. Die Pfropfungsgrade sind fur PE htiher als fur EPDM; bei PE/EPDM-Blends

Thermal properties of silane-grafted water-crosslinked polyethylene

“…There have been some articles [3][4][5][6][7][8][9] published on the crosslinking of polyethylene. Sen and colleagues 3,4 reported some kinetics data, studied by differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and dynamic mechanical analysis (DMA), on silane grafting and moisture crosslinking of polyethylene and ethylene propylene rubber.…”

“…Sen and colleagues 3,4 reported some kinetics data, studied by differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and dynamic mechanical analysis (DMA), on silane grafting and moisture crosslinking of polyethylene and ethylene propylene rubber. Kao and Phillips 5 reported the crystallinity and other structural information, using DSC and XRD, of low-density polyethylene (LDPE) crosslinked by dicumyl peroxide.…”

Silane grafting reactions of LDPE, HDPE, and LLDPE

“…HDPE (LH606) was received from USI Far East Corporation (Taipei, Taiwan) with a melt index of 1.0 and a density of 0.961 g/cm 3 . LLDPE (AL3108ZD) was received from Exxon Corporation with 3.5 mol % of 1-hexene in the copolymer, a melt index of 0.8, and a density of 0.921 g/cm 3 . The peroxide used was dicumyl peroxide supplied by Aldrich Chemical Company (Milwaukee, WI).…”

“…LDPE (H0100) was received from Asia Polymer Corporation (Taipei, Taiwan) with a melt index (ASTM D1238) of 0.5 and a density (ASTM D1505) of 0.922 g/cm 3 . HDPE (LH606) was received from USI Far East Corporation (Taipei, Taiwan) with a melt index of 1.0 and a density of 0.961 g/cm 3 . LLDPE (AL3108ZD) was received from Exxon Corporation with 3.5 mol % of 1-hexene in the copolymer, a melt index of 0.8, and a density of 0.921 g/cm 3 .…”

“…Sen and colleagues 2,3 reported some kinetics data, studied by differential scanning calorimetry (DSC), X-ray diffractometer, and dynamic mechanical analysis, on silane grafting and moisture cross-linking of PE and ethylene propylene rubber. Kao and Phillips 4 reported the crystallinity and other structural information, using DSC and X-ray diffractometer, of LDPE cross-linked by dicumyl peroxide.…”