We report the in-situ synthesis of poly(lactic acid)–halloysite nanotubes (PLA-HNT) bionanocomposites, with a perspective to improve the interaction between PLA and HNT. Three PLA-HNT bionanocomposites with different HNT weight percentages were synthesized by polycondensation, followed by azeotropic distillation technique. Fourier transform infrared spectroscopy studies indicated the existence of hydrogen bonding between terminal hydroxyl groups of PLA and Si–O–Si groups present in the outer surface of HNT. Wide-angle X-ray diffraction, 29Si- and 27Al-nuclear magnetic resonance spectroscopy analysis confirmed the intercalation of PLA into HNT. Scanning electron microscopy analysis confirmed that there was no significant agglomeration and PLA matrix was found to be embedded with HNT. Transmission electron microscopy analysis also gave ample proof to substantiate the intercalation of PLA chains into HNT. Studies on zeta potential of PLA-HNT bionanocomposites, as compared with PLA, also confirmed the interactions between PLA and HNT. Single melting peak in differential scanning calorimetry analysis indicated the existence of one form of crystalline structure.
At the request of the Journal Editor and SAGE Publishing, the following article has been retracted:
Manju P, Krishnan PSG, Nayak S. Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites. Polymers and Polymer Composites. 2021;29(6):684-695. doi:10.1177/0967391120927799
A reader contacted the Journal Editor, citing concerns that this article has significant unattributed overlap of text and figures from the following articles:
Manju, P., Krishnan, P.S.G. & Nayak, S.K. In-situ polymerised PLA-SEP bionanocomposites: effect of silanol groups on the properties of PLA. J Polym Res 27, 134 (2020). https://doi.org/10.1007/s10965-020-02098-1
P. Manju, P. Santhana Gopala Krishnan* and S. K. Nayak. Effect of morphology and hydroxyl groups of different nanoparticles on the properties of PLA bionanocomposites. Materials Today: Proceedings 2021, 41(5), 1169-1174. https://doi.org/10.1016/j.matpr.2020.09.508
The authors explained that the images differed due to scale adjustments and the text was unattributed as the other article was not published at the time of writing. The Journal Editor has determined this response unsatisfactory. Due to concerns about text overlap and reuse of previously published images, the article has been retracted.
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