Details

Autor(en) / Beteiligte

• Nishiwaki, Yasumasa
• Masutani, Kazunari
• Kimura, Yoshiharu
• Lee, Chan‐Woo

Titel

Controlling the thermomechanical properties of biobased ABA triblock copolymers comprising polylactide (A) and poly(1,2‐propylene succinate) (B) with high molecular weight

Ist Teil von

• Journal of polymer science (2020), 2020-03, Vol.58 (6), p.860-871

Ort / Verlag

Hoboken, USA: John Wiley & Sons, Inc

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Bis‐hydroxyl‐terminated poly(1,2‐propylene succinate) (PPS‐diols) with high molecular weight (10–40 kDa) are prepared by two‐step melt polycondensation of succinic acid and 1,2‐propanediol with Ti(BuO)4 as the catalyst. By using these PPS‐diols as macroinitiators, the ring‐opening polymerization of d‐ and l‐lactides is readily conducted to obtain enantiomeric ABA triblock copolymers consisting of poly(l‐lactide) and PPS (B) (t‐l‐PPS) as well as those of poly(d‐lactide) and PPS (B) (t‐d‐PPS) which have higher PPS compositions (20–70 wt%) in addition to high molecular weight (20–80 kD). The Tg, Tm, and ΔHm values of the t‐l‐PPS copolymers as well as the stereo mixtures of t‐l‐PPS/t‐d‐PPS are controlled to linearly decrease with increasing the PPS content. The copolymers also exhibit higher elastomeric properties with increasing the PPS content. The tensile properties of the copolymer films having higher PPS contents (both the single block copolymers and stereo mixtures) are comparable to those of the oil‐based thermoplastic elastomers. It is therefore concluded that these block copolymers can afford thermoplastic elastomers or flexible plastic materials having a 100% biobased content. Enantiomeric ABA triblock copolymers consisting of poly(l‐lactide) and poly(1,2‐propylene succinate) (PPS) (B) (t‐L‐PPS) as well as those of poly(d‐lactide) and PPS (B) (t‐d‐PPS) were prepared by the ring‐opening polymerization of d‐ and l‐lactide using PPS‐diols as macroinitiators. The copolymers showed higher elastomeric properties with increasing PPS content. It is therefore concluded that these block copolymers can afford thermoplastic elastomers or flexible plastic materials having 100% biobased content.