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- W3195159654 abstract "This thesis is based on three main studies, all dealing with structure-propertyinvestigation of semicrystalline polyolefin-based composites. Low density poly(ethylene)(LDPE) and isotactic poly(propylene) (iPP) were chosen as parts of the composites materialsand they were investigated either separately (as homoploymers), either in blend systems withthe composition LDPE/iPP 80/20 or as filled matrix with layered silicate (montmorillonite).The beneficial influence of adding ethylene-co-propylene polymer of amorphousnature, to low density poly(ethylene)/isotactic poly(propylene) (80/20) blend is demonstrated.This effect is expressed by the major improvement of mechanical properties of ternary blendsas examined at a macroscopic size scale by means of tensile measurements. The structureinvestigation also reveals a clear dependence of the morphology on adding ethylene-copropylenepolymer. Both the nature and the content of ethylene-co-propylene polymer affectstructure and properties. It is further demonstrated that the extent of improvement inmechanical properties is to be related to the molecular details of the compatibilizer.Combination of high molecular weight and high ethylene content is appropriate for thestudied system where the poly(ethylene) plays the role of matrix.A new way to characterize semicrystalline systems by means of Brillouinspectroscopy is presented in this study. By this method based on inelastic light scattering, wewere able to measure the high frequency elastic constant (c11) of the two microphases in thecase where the spherulites size is exhibit size larger than the size of the probing phononwavelength. In this considered case, the sample film is inhomogeneous over the relevantlength scales and there is an access to the transverse phonon in the crystalline phase yieldingthe elastic constant c44 as well. Isotactic poly(propylene) is well suited for this type ofinvestigation since its morphology can be tailored through different thermal treatment fromthe melt. Two distinctly different types of films were used; quenched (low crystallinity) andannealed (high crystallinity). The Brillouin scattering data are discussed with respect to thespherulites size, lamellae thickness, long period, crystallinity degree and well documented byAFM images.The structure and the properties of isotactic poly(propylene) matrix modified byinorganic layered silicate, montmorillonite, are discussed with respect to the clay content.Isotactic poly(propylene)-graft-maleic anhydride was used as compatibilizer. It is clearlydemonstrated that the property enhancement is largely due to the ability of layered silicate toexfoliate. The intimate dispersion of the nanometer-thick silicate result from a delicatebalance of the content ratio between the isotactic poly(propylene)-graft-maleic anhydridecompatibilizer and the inorganic clay.%%%%Diese dreigeteilte Arbeit befasst sich mit der Untersuchung von Struktur undEigenschaften von teilkristallinen Polyolefin-Verbundwerkstoffen. Als Komponenten der…" @default.
- W3195159654 created "2021-08-30" @default.
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- W3195159654 date "2006-01-01" @default.
- W3195159654 modified "2023-09-27" @default.
- W3195159654 title "Structure and properties of composite polyolefin materials" @default.
- W3195159654 hasPublicationYear "2006" @default.
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