Crystallization, structure and properties of polylactide/ladder poly(silsesquioxane) blends

Herc, Agata S.; Bojda, Joanna; Nowacka, Maria; Lewiński, Piotr; Maniukiewicz, Waldemar; Piórkowska, Ewa; Kowalewska, Anna

doi:10.1016/j.polymer.2020.122563

Cited by 15 publications

(27 citation statements)

References 48 publications

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“…PLLA covalently attached to MWCNT (PL-g-CNT) was synthesized by ring-opening polymerization of L,L-lactide according to a well-established procedure [ 53 , 54 ]. LPSQ-COOMe was synthesized as previously described [ 38 , 39 ]. Procedures for the synthesis of PL-g-CNT and LPSQ-COOMe are described below.…”

Section: Methodsmentioning

confidence: 99%

“…LPSQ-COOMe was synthesized as previously described [ 38 , 39 ]. Methyl thioglycolate (Acros Organics, 95%) was added into a solution of ladder-like poly(vinylsilsesquioxanes), M n = 1000 g/mol, M w /M n = 1.4, obtained as described in [ 56 ], dissolved in dry THF (c = 8 wt.%) and placed in a quartz crucible.…”

Section: Methodsmentioning

confidence: 99%

“…The 1 H NMR spectrum is shown in Figure S1 of Supporting Information (SI) . Full NMR characteristics have been previously published in [ 38 , 39 ].…”

Section: Methodsmentioning

confidence: 99%

“…To broaden its applications, PLA’s properties are modified by various routes, including copolymerization, chain extension, plasticization, blending with other polymers, fillers, nanofillers, and fibers [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. PLA modification with oligomeric linear ladder poly(silsesquioxane)s (LPSQ-R) with different sides substituents, including methoxycarbonyl (R = COOMe) groups was described recently by Herc et al [ 38 ]. LPSQ-R are well-defined macromolecules with a double chain siloxane backbone, which makes them more rigid than typical polysiloxanes and limits their coiling in solutions.…”

Section: Introductionmentioning

confidence: 99%

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Modification of Polylactide Nonwovens with Carbon Nanotubes and Ladder Poly(silsesquioxane)

et al. 2021

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Electrospun nonwovens of poly(L-lactide) (PLLA) modified with multiwall carbon nanotubes (MWCNT) and linear ladder-like poly(silsesquioxane) with methoxycarbonyl side groups (LPSQ-COOMe) were obtained. MWCNT and LPSQ-COOMe were added to the polymer solution before the electrospinning. In addition, nonwovens of PLLA grafted to modified MWCNT were electrospun. All modified nonwovens exhibited higher tensile strength than the neat PLA nonwoven. The addition of 10 wt.% of LPSQ-COOMe and 0.1 wt.% of MWCNT to PLLA increased the tensile strength of the nonwovens 2.4 times, improving also the elongation at the maximum stress.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The 1 H NMR spectrum is shown in Figure S1 of Supporting Information (SI) . Full NMR characteristics have been previously published in [ 38 , 39 ].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modification of Polylactide Nonwovens with Carbon Nanotubes and Ladder Poly(silsesquioxane)

et al. 2021

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“…Hydrogen bonding between polylactide and nucleating agents has been postulated, e.g., for PLA blends with amino acids or poly(amino acids) [ 22 ], carbon nanotubes [ 23 ], phtalimide [ 24 ], bisurea derivatives [ 25 ], or d -gluconic acid derivatives [ 26 ]. PLA was also modified with macromolecular nucleators, such as linear polysilsesquioxanes [ 27 , 28 , 29 ] or their cyclosiloxane analogues [ 30 ] with side substituents acting as donors/acceptors of hydrogen bonds (-OH···O=C-; -COOH···O=C-; and -C-F···H 3 C-) to/from the polyester backbone.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Interactions in Hybrid Polylactide Blends—The Structures, Mechanisms and Properties

Kowalewska

Nowacka

2020

Molecules

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The conformation of polylactide (PLA) chains can be adjusted by supramolecular interactions (the formation of hydrogen bonds or host-guest complexes) with appropriate organic molecules. The structures formed due to those intermolecular interactions may act as crystal nuclei in the PLA matrix (“soft templating”). In this review, the properties of several supramolecular nucleating systems based on synthetic organic nucleators (arylamides, hydrazides, and 1,3:2,4-dibenzylidene-d-sorbitol) are compared to those achieved with biobased nucleating agents (orotic acid, humic acids, fulvic acids, nanocellulose, and cyclodextrins) that can also improve the mechanical properties of PLA. The PLA nanocomposites containing both types of nucleating agents/additives are discussed and evaluated in the context of their biomedical applicability.

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Highly Tough and Thermally Stable Polylactide Blends Compatibilized with Glycidyl Methacrylate‐Grafted Polypropylene

Lee

Hwang

Kwon

et al. 2021

Macro Materials & Eng

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To attain eco‐friendly and sustainable polylactide (PLA) materials possessing highly enhanced toughness, thermal stability, and processability without significant loss in elastic modulus, for the first time, PLA‐dominant blends with 1–30 wt% glycidyl methacrylate‐grafted polypropylene (PPGMA) loadings are fabricated via an efficient masterbatch melt‐compounding process. For the purpose, PPGMA is fabricated via in situ grafting reaction of PP with GMA and styrene. The scanning electron microscope images reveal that PLA/PPGMA blends do not show recognizable phase‐separated domains, unlike immiscible PLA/PP blends. The Fourier‐transform infrared spectroscopic and melt‐rheological analyses support the presence of specific interactions between PLA and PPGMA as well as the compatibilizing effect of PPGMA‐g‐PLA formed during the melt‐compounding. The thermal analyses demonstrate that PPGMA component accelerates the crystallization of PLA in the blends and that the thermal decomposition temperatures of PLA/PPGMA blends are higher than those of neat PLA and PPGMA components. The dynamic mechanical analysis shows that a maximum storage modulus is attained for PLA‐dominant blend with 30 wt% PPGMA. Noticeably, the impact strength (≈305.6 J m−1) of PLA‐dominant blend with only 5 wt% PPGMA loading is almost three times higher than that (≈111.6 J m−1) of neat PLA and it is very comparable to the value (≈316.9 J m−1) of neat PP.

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Crystallization, structure and properties of polylactide/ladder poly(silsesquioxane) blends

Cited by 15 publications

References 48 publications

Modification of Polylactide Nonwovens with Carbon Nanotubes and Ladder Poly(silsesquioxane)

Modification of Polylactide Nonwovens with Carbon Nanotubes and Ladder Poly(silsesquioxane)

Supramolecular Interactions in Hybrid Polylactide Blends—The Structures, Mechanisms and Properties

Highly Tough and Thermally Stable Polylactide Blends Compatibilized with Glycidyl Methacrylate‐Grafted Polypropylene

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