1. Compatibilization of polylactide/poly(ethylene 2,5-furanoate) (PLA/PEF) blends for sustainable and bioderived packagingGiulia Fredi, Andrea Dorigato, Alessandro Dussin, Eleftheria Xanthopoulou, Dimitrios Bikiaris, Luigi Botta, Vincenzo Fiore, Alessandro Pegoretti, 2022, izvirni znanstveni članek Opis: Despite the advantages of polylactide (PLA), its inadequate UV-shielding and gas-barrier
properties undermine its wide application as a flexible packaging film for perishable items. These
issues are addressed in this work by investigating the properties of melt-mixed, fully bioderived
blends of polylactide (PLA) and poly(ethylene furanoate) (PEF), as a function of the PEF weight
fraction (1–30 wt %) and the amount of the commercial compatibilizer/chain extender Joncryl ADR
4468 (J, 0.25–1 phr). J mitigates the immiscibility of the two polymer phases by decreasing and
homogenizing the PEF domain size; for the blend containing 10 wt % of PEF, the PEF domain size
drops from 0.67 ± 0.46 µm of the uncompatibilized blend to 0.26 ± 0.14 with 1 phr of J. Moreover,
the increase in the complex viscosity of PLA and PLA/PEF blends with the J content evidences
the effectiveness of J as a chain extender. This dual positive contribution of J is reflected in the
mechanical properties of PLA/PEF blends. Whereas the uncompatibilized blend with 10 wt % of
PEF shows lower mechanical performance than neat PLA, all the compatibilized blends show higher
tensile strength and strain at break, while retaining their high elastic moduli. The effects of PEF
on the UV- and oxygen-barrier properties of PLA are also remarkable. Adding only 1 wt % of PEF
makes the blend an excellent barrier for UV rays, with the transmittance at 320 nm dropping from
52.8% of neat PLA to 0.4% of the sample with 1 wt % PEF, while keeping good transparency in the
visible region. PEF is also responsible for a sensible decrease in the oxygen transmission rate, which
decreases from 189 cc/m2
·day for neat PLA to 144 cc/m2
·day with only 1 wt % of PEF. This work
emphasizes the synergistic effects of PEF and J in enhancing the thermal, mechanical, UV-shielding,
and gas-barrier properties of PLA, which results in bioderived blends that are very promising for
packaging applications.
Ključne besede: polylactide, furanoates, poly(ethylene furanoate), blends, compatibilization, gas-permeability, UV-shielding
Objavljeno v DKUM: 24.03.2025; Ogledov: 0; Prenosov: 3
 Celotno besedilo (4,33 MB)
Gradivo ima več datotek! Več... |
2. The Use of Blends in English: A Corpus AnalysisBernarda Škafar, 2016, diplomsko delo Opis: Blending is a word-formation process where a new word is made by combining two or more words. The newly created word is called a blend or a portmanteau word. There are many patterns by which blends are formed. When coining the new word, at least one of the source words has to be shortened. Blends are therefore formed by using fragments of source words. These fragments are called splinters. Besides shortening, blends can also be formed by retaining both source words if they share common sounds or letters.
While many blends become a part of everyday language, some blends quickly disappear after the initial popularity.
The graduation thesis is divided into two parts – theoretical and empirical. The first part is mainly concerned with the theoretical background of the blending process and word-formation in general. It also describes The Corpus of Contemporary American English (COCA) in more detail. The empirical part is based on a corpus analysis, where we research the usage of blends in contemporary English by analysing a selected list of blends from The Corpus of Contemporary American English (COCA).
Ključne besede: word-formation, blending, blends, clipping, overlapping
Objavljeno v DKUM: 12.09.2016; Ogledov: 1218; Prenosov: 115
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3. Experimental analysis of injection characteristics using biodiesel fuelBreda Kegl, Aleš Hribernik, 2006, izvirni znanstveni članek Opis: This paper deals with injection characteristics using different fuels at different fuel temperatures. The fuels under consideration are neat biodiesel from rapeseed oil and some blends with diesel as well as neat mineral diesel D2. The fuel and fuel temperature influences are investigated experimentally in the mechanically controlled diesel fuel injection M system. At first, attention is focused on the injection characteristics, especially on fuelling, mean injection rate, mean injection pressure, injection timing, injection delay, and injection duration, which influence the most important engine characteristics. Furthermore, the influence of fuel temperature is investigated. On the basis of the measurements of pressure drop through the fuel filter, the minimum fuel temperature for safe engine operation is determined.
Ključne besede: internal combustion engines, fuel blends, biodiesel fuel, temperature influence, injection characteristics
Objavljeno v DKUM: 31.05.2012; Ogledov: 1840; Prenosov: 107
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