Affiliation:
1. School of Materials Science and Chemical Engineering Ningbo University Ningbo China
2. Key Laboratory of Impact and Safety Engineering, Ministry of Education Ningbo University Ningbo China
3. College of Biosystems Engineering and Food Science Zhejiang University Hangzhou China
Abstract
AbstractBlending with ductile polycaprolactone (PCL) is one of the common toughening methods for polylactic acid (PLA). However, it seems inevitable to experience a trade‐off in mechanical strength and thermal stability of PLA. Therefore, this study aimed to improve the mechanical and thermal properties of PLA/PCL blends by adding different contents of talc (0–10 wt%) and conducting annealing treatments. Interestingly, the maximum tensile strength (52.04 MPa), elongation at break (83.51%), and impact strength (6.05 kJ/m2) were achieved by incorporating 2.5 wt% talc into the blends without annealing. Meanwhile, the addition of just 1 wt% talc shortened the semi‐crystallization time of PLA to one‐third of the neat PLA at 100°C. Particularly, after annealing treatment, the crystallinity of PLA increased to 32.1%, and the Vicat softening temperature reached as high as 133.3°C with 2.5 wt% talc. Importantly, the increase in crystallinity did not compromise the toughness of PLA composites but significantly enhanced the impact strength to 8.91 kJ/m2. This study provides an updated understanding of the relationship between toughness and crystallinity in PLA composites.Highlights
Thermo‐resistance of polylactic acid (PLA) composite increases to 133.3°C.
Talc aids nucleation and promotes PLA crystallization.
Increased crystallinity and high toughness are simultaneously realized.
Adding 1 wt% talc reduced PLA semi‐crystallization time by one‐third.
Crystal transformation and sea‐islands structure are vital for reinforcements.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Polymers and Plastics,General Chemistry,Ceramics and Composites
Cited by
2 articles.
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