Composites based on polypropylene recyclates and natural fibers

Abstract

STANIS£AW KUCIEL 1)*) , ANETA LIBER-KNEAE 1)*) , STANIS£AW ZAJCHOWSKI 2) Kompozyty z w³óknami naturalnymi na osnowie recyklatu polipropylenu Streszczenie-Metod¹ wtryskiwania wytworzono próbki kompozytów na osnowie oryginalnego polipropylenu b¹dŸ jego recyklatu, nape³niane w³óknami juty, sizalu, konopi lub kotoniny lnianej. Oceniono wp³yw dodatku trzech ró¿nych kompatybilizatorów oraz procesu alkalizacji w³ókien na charakterystykê uzyskanych materia³ów. Zbadano podstawowe w³aoeciwooeci wytrzyma-³ooeciowe i przetwórcze oraz oznaczano ch³onnooeae wody oraz wp³yw na nie zmiennych d³ugotrwa-³ych obci¹¿eñ. Przedstawiono mo¿liwooeae zastosowania takich kompozytów. S³owa kluczowe: kompozyty, w³ókna naturalne, recyklaty, polipropylen, kompatybilizatory. COMPOSITES BASED ON POLYPROPYLENE RECYCLATES AND NATURAL FIBERS Summary-The processing by reactive extrusion method of composites based on virgin polypropylene and its recyclates filled with fibers of jute, sisal, hemp or cottonized flax has been presented (Tables 1 and 2). The influence of the addition of three different compatibilizers and fiber alkalization on the properties of the obtained materials was evaluated. The basic mechanical and process properties (Tables 3, 4, Figs. 2-13) as well as water absorption (Fig. 1) were determined and the influence of cyclic loading on them estimated. The potentials and applicability of these composites were also presented.

Analysis of structural changes in injection‐molded parts due to cyclic loading

“…Relations σ(ε) obtained from the tension-compression test and hysteresis loops, determined at the loading below the yield point, inform about the material behavior in the range of elastic strain. [4][5][6][7][8][9] | 2135 BOCIAGA et Al. The result of this phenomenon is a nonlinear σ − ε relation in the first cycle.…”

“…The experiments involved ratcheting tests and ratcheting-creep ones. [5] Samples were cyclically loaded with a frequency of 5 Hz at the increasing force of load. Kuciel et al [5][6][7] tested the fatigue behavior of different polymer composites.…”

“…[3] The analysis of the behavior of polymeric parts subjected to cyclic loading has been presented in some works. [4][5][6][7][8][9] | 2135 BOCIAGA et Al.…”

“…It was found that the sample damage is accumulated under cyclic deformation, whereas creeping results in a growth of permanent plastic strain. Kuciel et al [5][6][7] tested the fatigue behavior of different polymer composites. The results of tests carried out on injection-molded parts made of polypropylene filled with 40% of the hemp fiber were described in paper.…”

“…The results of tests carried out on injection-molded parts made of polypropylene filled with 40% of the hemp fiber were described in paper. [5] Samples were cyclically loaded with a frequency of 5 Hz at the increasing force of load. An increase in mechanical energy dissipated, reduction of inclination angle of the consecutive loops (connected with a decrease in elasticity modulus), and an increase in strain were noticed, which finally leads to the fatigue break of the sample.…”