Article (Scientific journals)
Balancing the Strength-Impact Relationship and Other Key Properties in Polypropylene Copolymer-Natural CaSO4 (Anhydrite)-Filled Composites.
Murariu, Marius; Laoutid, Fouad; Paint, Yoann et al.
2023In International Journal of Molecular Sciences, 24 (16), p. 12659
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Keywords :
REx; automotive and engineering applications; calcium sulfate; gypsum and anhydrite II; impact polypropylene copolymers; mineral-filled composites; polypropylene (PP); reactive extrusion; thermal and mechanical properties; Polypropylenes; Calcium Sulfate; Polymers; Bone Screws; Crystallization; Cell-Derived Microparticles; Catalysis; Molecular Biology; Spectroscopy; Computer Science Applications; Physical and Theoretical Chemistry; Organic Chemistry; Inorganic Chemistry; General Medicine
Abstract :
[en] To develop novel mineral-filled composites and assess their enhanced properties (stiffness, a good balance between mechanical strength and impact resistance, greater temperature stability), a high-impact polypropylene copolymer (PPc) matrix containing an elastomeric discrete phase was melt mixed with natural CaSO4 β-anhydrite II (AII) produced from gypsum rocks. First, in a prior investigation, the PPc composites filled with AII (without any modification) displayed enhanced stiffness, which is correlated with the relative content of the filler. The tensile and impact strengths dramatically decreased, especially at high filling (40 wt.%). Therefore, two key methods were considered to tune up their properties: (a) the ionomeric modification of PPc composites by reactive extrusion (REx) with zinc diacrylate (ZA), and (b) the melt mixing of PPc with AII surface modified with ethylenebis(stearamide) (EBS), which is a multifunctional processing/dispersant additive. The properties of composites produced with twin-screw extruders (TSEs) were deeply assessed in terms of morphology, mechanical, and thermal performance, including characterizations under dynamic mechanical solicitations at low and high temperatures. Two categories of products with distinct properties are obtained. The ionomeric modification by Rex (evaluated by FTIR) led to composites characterized by remarkable thermal stability, a higher temperature of crystallization, stronger interfacial interactions, and therefore noticeable mechanical properties (high tensile strength (i.e., 28 MPa), increased stiffness, moderate (3.3 kJ/m2) to good (5.0 kJ/m2) impact resistance) as well as advanced heat deflection temperature (HDT). On the other hand, the surface modification of AII with EBS facilitated the dispersion and debonding of microparticles, leading to composites revealing improved ductility (strain at break from 50% to 260%) and enhanced impact properties (4.3-5.3 kJ/m2), even at high filling. Characterized by notable mechanical and thermal performances, high whiteness, and a good processing ability, these new PPc-AII composites may be tailored to meet the requirements of end-use applications, ranging from packaging to automotive components.
Disciplines :
Materials science & engineering
Author, co-author :
Murariu, Marius ;  Laboratory of Polymeric and Composite Materials, Materia Nova Materials R&D Center & UMONS Innovation Center, 3 Avenue Copernic, 7000 Mons, Belgium ; Laboratory of Polymeric and Composite Materials, Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, 7000 Mons, Belgium
Laoutid, Fouad  ;  Université de Mons - UMONS > Unités externe > Materia Nova ASBL
Paint, Yoann ;  Université de Mons - UMONS > Unités externe > Materia Nova ASBL
Murariu, Oltea ;  Université de Mons - UMONS > Unités externe > Materia Nova ASBL
RAQUEZ, Jean-Marie  ;  Université de Mons - UMONS > Faculté des Science > Service des Matériaux Polymères et Composites
DUBOIS, Philippe  ;  Université de Mons - UMONS > Faculté des Science > Service des Matériaux Polymères et Composites
Language :
English
Title :
Balancing the Strength-Impact Relationship and Other Key Properties in Polypropylene Copolymer-Natural CaSO4 (Anhydrite)-Filled Composites.
Publication date :
10 August 2023
Journal title :
International Journal of Molecular Sciences
ISSN :
1661-6596
eISSN :
1422-0067
Publisher :
Multidisciplinary Digital Publishing Institute (MDPI), Switzerland
Volume :
24
Issue :
16
Pages :
12659
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
S816 - Matériaux Polymères et Composites
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
Funders :
Toro Gips S.L.
Materia Nova R&D Center
Funding text :
This research was funded by Toro Gips S.L. (Barcelona, Spain), grant “TOROGYPS”, and by the Materia Nova R&D Center using internal funding.
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since 15 December 2023

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