Use of the Raman-Active Longitudinal Acoustic Mode in the Characterization of Reactively Extruded Polyethylenes

Maleic acid grafted low density polyethylene for thermally sprayable anticorrosive coatings

“…To overcome this deficiency and to facilitate compatibilization with polar polymers, polyethylenes have been chemically modified through functionalization or grafting. This process introduces polar groups onto the polymer main chain as pendant units or short-chain branching [5]. It can be achieved by copolymerization of new monomers or by modification or blending of existing polymers [6].…”

Degradation of Different Types of Polyethylene Using for Lining System Exposed to Hydrochloric Acid Solution

“…However, because of its typical non-polar characteristic, which leads to poor adhesion onto steel substrate, the polyethylene used for lining needs to be modified in order to improve the adhesion strength. Chemical modification is one solution for adhering polyethylene onto substrate surface by introducing a polar group onto the polymer main chain as pendant units or as short chain-branches 2 . This modification can be done by copolymerization of new monomers 3 .…”

Thermal Properties and SSA Fractionation of Metallocene Ethylene‐Oct‐1‐ene Copolymers with High Comonomer Content Cross‐linked by Dicumyl Peroxide or β‐Radiation

“…In other words, T s would be high enough to melt all the crystalline regions except for small crystal fragments and/or nuclei that can later self-seed the polymer during cooling. [24,25] After that, the sample was heated once again up to a temperature 5 8C below T s and held there for 5 min. In this way, the unmelted crystals at this temperature would anneal, and some of the melted species would isothermally crystallize during the subsequent cooling.…”

“…However, the total crystallinity decreases when comparing it with the data of the corresponding neat copolymer. Several authors [25,38,39] have reported reorganization processes in amorphous regions after polymer cross-linking, arising from chain scission phenomena, that lead to larger size crystalline populations.…”

“…Only slight changes in crystal populations can be detected in irradiated samples at 200 kGy, because they remain unaffected at low irradiation dose (25 kGy). As discussed before, in the case of EG8411, there are some reorganization processes [25] that could be responsible for the slight change, especially in its larger crystals, where a thickening at 65-75 8C can be seen. The rest of the crystal sizes do not exhibit any alteration.…”