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Nucleating Agent-Containing P(LLA-mb-BSA) Multi-Block Copolymers as Ultra-tough Bioplastics and High Performance Thermoplastic Elastomers with Balanced Mechanical Properties.
Nucleating Agent-Containing P(LLA-mb-BSA) Multi-Block Copolymers as Ultra-tough Bioplastics and High Performance Thermoplastic Elastomers with Balanced Mechanical Properties.
In order to obtain high performance bioplastics and thermoplastic elastomers, P(LLA-mb-BSA) multi-block copolymerscontaining 30 wt % and 70 wt % soft segment (PLBSA30 and PLBSA70 for short) were synthesized via chain extension and coupling ofpoly(L-lactic acid) (PLLA) and poly(butylene succinate-co-adipate) (PBSA) prepolymers in the presence of 1% nucleating agent (NA). Theywere characterized with proton nuclear magnetic resonance (1H NMR), gel permeation chromatography (GPC), differential scanningcalorimetry (DSC), polarizing optical microscopy (POM), thermal gravimetric analysis (TGA), transmission electron microscope (TEM),and tensile and impact test. The relatively high molecular weights of (Mn 8200 g/mol and 3100 g/mol for PLLA and PBSA, respectively) thepolyester sequences are helpful to improve the PLLA crystallization and the flexibility of the PBSA soft segment. Nucleation effect furtheraccelerates the crystallization of PLLA segment. The synergistic effect of these factors results in good balance between stiffness and toughness.PLBSA30s containing 1% zinc citrate (ZnCC) or talc behave as ultra-tough bioplastics with ultrahigh impact strength over 50 kJ/m2 andexcellent tensile properties. PLBSA70 containing 1% ZnCC possesses elongation at break of 600% and retains high modulus (56 MPa) andstrength (16 MPa) and therefore behaves as an excellent thermoplastic elastomer. The excellent and balanced properties would extend the
end applications of these PLLA-based materials.
