Segmental mobility in linear polylactides of various molecular weights

Klonos, Panagiotis A.; Bikiaris, Nikolaos D.; Barmpalexis, Panagiotis; Kyritsis, Apostolos

doi:10.1016/j.polymer.2024.127177

Cited by 2 publications

(1 citation statement)

References 70 publications

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“…These differences are not expected to arise from the different M n values of the two PLAs. For the sake of completeness, based on previous knowledge on the T g ( M n ) dependence for PLA, 19,62,63 we report that the expected M n threshold for chain entanglements is ∼8–25 kg mol −1 . Our PLAs are above that threshold, namely, the T g is stabilized with respect to M n .…”

Section: Resultsmentioning

confidence: 75%

Structure–property relationships in renewable composites of poly(lactic acid) reinforced by low amounts of micro- and nano-kraft-lignin

Makri,

Klonos,

Marra

et al. 2024

Soft Matter

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Section: Resultsmentioning

confidence: 75%

Structure–property relationships in renewable composites of poly(lactic acid) reinforced by low amounts of micro- and nano-kraft-lignin

Makri,

Klonos,

Marra

et al. 2024

Soft Matter

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Novel Biobased Copolymers Based on Poly(butylene succinate) and Cutin: In Situ Synthesis and Structure Properties Investigations

Balla,

Klonos,

Kyritsis

et al. 2024

Polymers

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The present work describes the synthesis of poly(butylene succinate) (PBSu)-cutin copolymers by the two-stage melt polycondensation method, esterification and polycondensation. Cutin was added in four different concentrations, 2.5, 5, 10, and 20 wt%, in respect to succinic acid. The obtained copolymers were studied using a variety of techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), polarized light microscopy (PLM), as well as diffuse reflectance spectroscopy (DRS). A series of results, in agreement between different techniques, revealed the formation of PBSu-cutin interactions, confirming indirectly the successful in situ synthetic route of copolymers. DSC and XRD combined with PLM results provided indications that the crystallization temperature increases with the addition of small amounts of cutin and gradually decreases with increasing concentration. The crystallization process was easier and faster at 2.5%, 5%, and 10% concentrations, whereas at 20%, it was comparable to neat PBSu. The presence of cutin, in general, leads to the facilitated crystallizability of PBSu (direct effect), whereas a moderate drop in the glass transition temperature is recorded, the latter being an indirect effect of cutin via crystallization. The thermal stability improved in the copolymers compared to neat PBSu. Water contact angle measurements confirmed that the addition of cutin decreased the hydrophilicity. The local and segmental relaxation mapping is demonstrated for PBSu/cutin here for the first time. Enzymatic hydrolysis and soil degradation tests showed that, overall, cutin accelerated the decomposition of the polymers. The copolymers may be proven useful in several applications.

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Segmental mobility in linear polylactides of various molecular weights

Cited by 2 publications

References 70 publications

Structure–property relationships in renewable composites of poly(lactic acid) reinforced by low amounts of micro- and nano-kraft-lignin

Structure–property relationships in renewable composites of poly(lactic acid) reinforced by low amounts of micro- and nano-kraft-lignin

Novel Biobased Copolymers Based on Poly(butylene succinate) and Cutin: In Situ Synthesis and Structure Properties Investigations

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