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DOI: 10.1039/D2RA90003C (Correction) RSC Adv., 2022, 12, 5280-5280

Correction: Synthesis and stereocomplex formation of enantiomeric alternating copolymers with two types of chiral centers, poly(lactic acid-alt-2-hydroxybutanoic acid)s

Hideto Tsuji*, Kazuya Nakayama and Yuki Arakawa
Department of Applied Chemistry and Life Science, Graduate School of Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan. E-mail: ht003@edu.tut.ac.jp

Received 24th January 2022 , Accepted 24th January 2022

First published on 11th February 2022

Abstract

Correction for ‘Synthesis and stereocomplex formation of enantiomeric alternating copolymers with two types of chiral centers, poly(lactic acid-alt-2-hydroxybutanoic acid)s’ by Hideto Tsuji et al., RSC Adv., 2020, 10, 39000–39007. DOI: 10.1039/D0RA08351H.

In the original manuscript, incorrect weight- and number-average molecular weights (Mw and Mn, respectively) were shown for the synthesized and used polymers in the 2. Experimental section. The correct Mw and Mn values of P(LLA-alt-L-2HB) and P(DLA-alt-D-2HB) were 3.00 × 104, 3.08 × 104, 1.53 × 104, and 1.54 × 104 g mol−1, respectively.

Due to the correction of the molecular weight values, the authors would like to remove the following statement regarding the suggested reason for the noncrystallizability of unblended P(LLA-alt-L-2HB) and P(DLA-alt-D-2HB) in the 3.2. Wide-angle X-ray diffractometry section based on the low molecular weight values: “The noncrystallizability of P(LLA-alt-L-2HB) and P(DLA-alt-D-2HB) may be due to their lower Mw values (Mw = 3.0 × 103 and 3.1 × 103, g mol−1, respectively) compared to those of the P(LLA-co-L-2HB) (56/44) and P(DLA-co-D-2HB) (52/48) random copolymers (Mw = 1.4 × 104 and 1.6 × 104, g mol−1, respectively) and P(LLA-alt-GA) and P(DLA-alt-GA) alternating copolymers (Mw = 4.8 × 103 and 5.9 × 103, g mol−1, respectively).”.

Due to the same reason, in the 3.3. Differential scanning calorimetry section, the authors would like to remove the statement “The lower Tm values of P(LLA-alt-L-2HB) and P(DLA-alt-D-2HB) can be attributable to the low molecular weights compared to those of PLLA and PDLA, P(LLA-co-L-2HB) (56/44) and P(DLA-co-D-2HB) (52/48), and P(LLA-alt-GA) and P(DLA-alt-GA).”. Additionally, the authors would like to replace the statement “The Tm values for P(LLA-alt-L-2HB)/P(DLA-alt-D-2HB) (Mw = 3.0 × 103 and 3.1 × 103, g mol−1, respectively) blends are higher than those for solvent-evaporated and melt-crystallized (Tc = 70 °C) P(L-2HB)/P(D-2HB) (Mw = 1.8 × 103 and 3.3 × 103, g mol−1, respectively) homopolymer blends (Tm = 173.0 and 172.1 °C, respectively)81 but lower than those for melt-crystallized (Tc = 130 °C) PLLA/PDLA (Mw = 4.0 × 103 and 5.4 × 103, g mol−1, respectively) homopolymer blends (Tm = 197.5 °C),78 and solvent-evaporated and melt-crystallized (Tc = 160 °C) P(LLA-co-L-2HB) (56/44)/P(DLA-co-D-2HB) (52/48) (Mw = 1.4 × 104 and 1.6 × 104, g mol−1, respectively) random copolymer blends (203.6 and 198.4 °C),63 and solvent evaporated and melt-crystallized (Tc = 100 °C) P(LLA-alt-GA)/P(DLA-alt-GA) (Mw = 4.8 × 103 and 5.9 × 103, g mol−1, respectively) blends (187.8 and 187.6 °C).67” with the revised statement “The Tm values for P(LLA-alt-L-2HB)/P(DLA-alt-D-2HB) (Mw = 3.0 × 104 and 3.1 × 104 g mol−1, respectively) blends are lower than those for solvent-evaporated and melt-crystallized (Tc = 70 °C) P(L-2HB)/P(D-2HB) (Mw = 3.1 × 104 and 3.3 × 104 g mol−1, respectively) homopolymer blends (Tm = 218.9 and 214.5 °C, respectively)81 and those for melt-crystallized (Tc = 130 °C) PLLA/PDLA (Mw = 4.0 × 103 and 5.4 × 103 g mol−1, respectively) homopolymer blends (Tm = 197.5 °C),78 and solvent-evaporated and melt-crystallized (Tc = 160 °C) P(LLA-co-L-2HB) (56/44)/P(DLA-co-D-2HB) (52/48) (Mw = 1.4 × 104 and 1.6 × 104 g mol−1, respectively) random copolymer blends (203.6 and 198.4 °C)63, but similar to those of solvent evaporated and melt-crystallized (Tc = 100 °C) P(LLA-alt-GA)/P(DLA-alt-GA) (Mw = 4.8 × 103 and 5.9 × 103 g mol−1, respectively) blends (187.8 and 187.6 °C).67”.

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

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