PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 tr t r l I t rit r i ( ) Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ il l li t . i i t.

www.elsevier.com/locate/procedia . l i r. /l t / r i

ScienceDirect

Procedia Structural Integrity 42 (2022) 139–146

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract In Europe, the amount of plastic waste which was recycled and further processed into new products was only about 13 % in 2020. One option to process higher volumes of post-consumer recyclates into new products is blending with virgin materials. In order to investigate the effect of recyclates on rheological and structural material properties, a post-consumer polypropylene recyclate (PP r) was added to a virgin polypropylene (PP-v) in different contents of 10 %, 25 % and 50 %, respectively. Mechanical and fracture mechanical properties were analysed and compared with initial conditions of the original virgin and recycled materials. In addition, the influence of two different recyclates (PP-r) was examined by using grades of a high (PP-r1) and low (PP-r2) melt flow rate (MRF). Results demonstrate that the blending of virgin material with recyclates had a clear influence on material properties. The MFR values increased with higher recyclate content. Tensile tests showed a reduction of the Young’s modulus a nd the yield strength with increasing recycling content. While tensile test properties were significantly affected by a recycling content over 10 %, notched Charpy Impact strength started to change above 25 % and 50 % of PP-r1 and PP-r2, respectively. The resistance against slow crack growth (SCG) of the materials was analysed by the crack round bar (CRB) test. Results indicate that a small recyclate amount of 10 % does not significantly reduce the SCG resistance of the blend compared to the virgin material. However, the SCG resistance decreases dramatically with higher recyclate content. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: polypropylene; recyclate; blends; mechanical properties; slow crack growth; cracked round bar test , t t l ti t i l t i t t l t i . ti t i l t l t i t t i l i it i i t i l . t i ti t t t l t l i l t t l t i l ti , t l l l t t i i l l i i t t t , , ti l . i l t i l ti l it i iti l iti t i i l i i l t i l . iti , t i l t i t l t i i i l lt l t . lt t t t t t l i i i t i l it l t l i l t i l ti . l i it i l t t t. il t t ti t l t i l t t it i i li t t. il t il t t ti i i i tl t li t t , t t t t t t t , ti l . i t i t l t t t i l l t t t. lt i i t t t ll l t t t i i i tl t i t t l t t i i t i l. , t i t ti ll it i l t t t. t . li l i . . This i an open access article under the CC li tt :// ti . /li / / . / i i ilit t : l r l ; r l t ; l ; i l r rti ; l r r t ; r r r t t 23 European Conference on Fracture - ECF23 Influence of Recyclates on Mechanical Properties and Lifetime Performance of Polypropylene Materials Jessica Hinczica a, *, Mario Messiha a , Thomas Koch b , Andreas Frank a , Gerald Pinter c a Polymer Competence Center Leoben GmbH, Leoben 8700, Austria b Institute of Materials Science and Technology, TU Wien, Vienna 1060, Austria c Materials Science and Testing of Poylmers, Montanuniversitaet Leoben, Leoben 8700, Austria essic a, a oc b a c a l t t , , t i b I tit t f t i l i l , i , i , t i c t i l i ti f l , t i it t , , t i

* Corresponding author. Tel.: +43-3842-42962-742; fax: +43-3842-42962-6. E-mail address: jessica.hinczica@pccl.at i t r. l.: - - - ; f : - - - . - il : j i . i i l. t rr

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.017 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 l i r . . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /) i i ilit t - t r . li