6533b860fe1ef96bd12c37c2

RESEARCH PRODUCT

Ion bombardment of polyethylene—influence of polymer structure

Davide TranchidaAndrzej TurosJacek JagielskiDariusz M. BielińskiP. Lipiński

subject

chemistry.chemical_classificationMaterials scienceIon beamPolymerPolyethyleneCondensed Matter PhysicsSurfaces Coatings and FilmsIonCondensed Matter::Soft Condensed MatterLinear low-density polyethyleneLow-density polyethylenechemistry.chemical_compoundCrystallinitychemistryChemical engineeringPolymer chemistryHigh-density polyethyleneInstrumentation

description

Abstract Polyethylenes of various macromolecular and supermolecular structures were studied from the point of view of their susceptibility to an ion beam treatment. An influence of molecular weight (Mw), molecular weight distribution (Mw/Mn) and the degree of branching were compared within the set of low-density polyethylenes (LDPE) studied. An influence of the length of branches was compared between LDPE, linear low-density (LLDPE) and high-density (HDPE) polyethylenes. An influence of the degree of crystallinity and the morphology of a crystalline phase were compared for HDPE samples solidified under various thermal conditions and ultra-high molecular weight polyethylene (UHMWPE). Plate polymer targets ∼2 mm were bombarded with 100 keV He+ or 130 keV Ar+ ions (dose of 1014–1016 ions/cm2; ion energy stream density Ar+ ion beam bombardment generally lowers micromechanical properties of the polyethylenes, whereas He+ ion beam treatment makes them higher. The effect is the stronger the higher the molecular weight of polyethylene. However, a long chain branching adversely affects the modification. The degree of crystallinity facilitates an ion beam bombardment from the point of view of micromechanical properties of the materials, however, also the morphology of a crystalline phase was found to play a role.

yearjournalcountryeditionlanguage
2007-06-01Vacuum
https://doi.org/10.1016/j.vacuum.2007.01.020