Polypropylene (PP) is a common thermoplastic and frequently adapted permanently with increasing requirements by adding fillers as well as reinforcing materials. Because of incompatibility of non-polar PP and polar inorganic filler, resulting composites are brittle which has a detrimental effect on the desired properties. Improvements in mechanical properties can be reached by compatibilization, creating of chemical couplings between phases and by increasing of inhomogeneity. Thus, maleic anhydride grafted PP is used as well as reactive processing of PP in presence of peroxide radical initiators. The temperature dependence of peroxide decay as well as the dependence of radical generation rate on time are two disadvantages of peroxide induced reactive processing. Modification of polymers with high energy electron treatment is also well known and used to form parts (after) molding as well as raw materials (pellets, powders, fibers) in solid state and at room temperature. The spatially and temporally precise input of energy is used to produce desired material properties on radical-induced chemical reactions. Coupling of high energy electron modification of polymers and melt mixing offers a new possibility of reactive processing. In this case, radical generation is independent of temperature, can be easily controlled by beam current and kept constant over time. Absence of any crystallinity, high reaction rates as well as intensive macromolecular mobility and intensive mixing are reasons to expect novel structures and properties. Electron beam induced reactive processing is a novel technique where chemical reactions are induced by spatial and temporal precise energy input via high energy electrons under dynamic conditions of melt mixing. This method gives the possibility to increase surface energy of polypropylene (PP) effectively as well as to generate chemical couplings between filler and PP. The process was applied to a proved system consisting of PP (38 wt%), magnesium hydroxide (MH) (60 wt%), triallyl cyanurate ...
Modifizierung der Werkstoffeigenschaften von Polypropylen-Kompositen durch eine Hochtemperatur-Elektronenbehandlung
24.02.2011
Hochschulschrift
Elektronische Ressource
Deutsch
info:eu-repo/classification/ddc/629 , ddc:629 , info:eu-repo/classification/ddc/620 , ddc:620 , Elektronenbestrahlung , Polypropylen , Mechanische Eigenschaft , Rheologie , reaktive Aufbereitung , reaktive Verarbeitung , Polypropylenkomposit , Magnesiumhydroxid , Schmelzebestrahlung , Elektronen induzierte reaktive Aufbereitung , EirA , Electron beam treatment , reactive compounding , reactive treatment , polypropylene composite , magnesium hydroxide , melt irradiation , electron induced reactive treatment
Polypropylen: Polymerdesign und Modifizierung
Kraftfahrwesen | 2005
|Leichtbau mit Gusseisen durch angepasste Werkstoffeigenschaften
IuD Bahn | 2003
|WERKSTOFFE - Leichtbau mit Gusseisen durch angepasste Werkstoffeigenschaften
Online Contents | 2003
|