Amino acids and poly(amino acids) as nucleating agents for poly(lactic acid)

Carbone, Maria Josefina; Vanhalle, Maja; Goderis, Bart; Puyvelde, Peter Van

doi:10.1515/polyeng-2014-0175

Cited by 20 publications

(24 citation statements)

References 35 publications

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“…In order to promote the crystallization of PLLA without compromising its bio-advantages, several biobased NAs with biodegradability, biocompatibility and nontoxicity like myoinositol, 32 thermoplastic starch, 33 orotic acid, 34 nucleobases, 35 xylan esters, 36 cyclodextrin complex, 37 lignin, 38 nanocelluloses, 39,40 amino acids and poly(amino acids) 41 have been developed. Among of these biobased NAs, it appears that orotic acid (OA), a naturally occurring substance (e.g., in milk products), is most effective in light of the signicant enhancement on crystallization kinetics of PLLA with only 0.3 wt% dosage (crystallization peak temperature is 123.…”

Section: -9mentioning

confidence: 99%

Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(l-lactic acid)

et al. 2017

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To gain an insight into the role of bound water of a nucleating agent in polymer nucleation, a biobased nucleating agent, orotic acid (OA), was selected as a model to investigate the effects on crystallization of poly(L-lactic acid) (PLLA). In such a context, two commercially available types of OA in anhydrous (OA-a) and monohydrated (OA-m) forms were melt mixed with PLLA, and their nucleation effectiveness on nonisothermal and isothermal melt crystallization of PLLA was comparatively studied. Results indicate that both forms of OA can significantly improve nonisothermal crystallization temperature and degree of crystallinity, overall isothermal crystallization rate, as well as nucleation density of PLLA. Interestingly, OA-a shows more prominent nucleation efficiency than OA-m. That is, the bound water of OA-m and its dehydration transition play a negative role in nucleation effects on PLLA crystallization. It is attributed to the deteriorated dispersion and the reduced active concentration of dehydration-transformed OA-a in PLLA/OA-m blends, as compared with pristine OA-a in PLLA/OA-a blends. Furthermore, an epitaxial mechanism is proposed to explain the nucleation phenomenon of PLLA/OA blends.

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Section: -9mentioning

confidence: 99%

Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(l-lactic acid)

et al. 2017

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“…The authors found that LAK301 acted as a very efficient nucleating agent by increasing crystallinity percentage from 5.6% in pure PLA [5]. Amino acids and poly(amino acids) were used as nucleating agents for PLA by Carbone et al in 2015 [6]. They indicated that polyglycine possessed a significant nucleating ability.…”

Section: Introductionmentioning

confidence: 99%

Non-Isothermal Crystallization Kinetics of Green Microalgae Filled Poly(Lactic Acid)

et al. 2019

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In this study, the effect of green microalgae as a nucleating agent on the non-isothermal crystallization of poly(lactic acid) (PLA) was investigated by differential scanning calorimeter and polarized optical microscope. The parameters of non-isothermal crystallization kinetics of PLA and PLA/green microalgae composites were obtained through common kinetic models such as Avrami, Ozawa, and combined Avrami and Ozawa. Moreover, nucleating activity of green microalgae and activation energies of composites were determined by the Dobreva-Gutzow and the Friedman methods, respectively. Dispersion of green microalgae in PLA was characterized using scanning electron microscopy. PLA/green microalgae composites having different green microalgae content from 5 to 20 wt% were prepared via solvent casting method. Although some agglomerated green microalgae was observed in the PLA matrix, it was found that the green microalgae were homogeneously distributed within the matrix at its lower loading levels. The Avrami and combined Avrami-Ozawa results showed that PLA/green microalgae composites have faster melt crystallization rates than that of pure PLA. Nucleating activity of green microalgae was proved by the Dobreva and Gutzow kinetic approach. Moreover, polarized optical microscope analysis revealed that crystallization onset temperature of PLA shifted to higher temperature upon cooling in the presence of green microalgae.

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“…Such a unique packing (supramolecular structure) gives polyglycine‐II attractive mechanical properties . Polyglycine is used for developing modified electrodes for electrochemical sensing of various chemicals, solid pH sensor and improving the properties of thermoplastics . In addition, polyglycine domains in natural proteins such as silk are shown to play important role in the mechanical properties of such proteins .…”

Section: Figurementioning

confidence: 99%

Spontaneous Single‐Crystal‐to‐Single‐Crystal Evolution of Two Cross‐Laminated Polymers

Athiyarath

Sureshan

2018

Angew Chem Int Ed

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Twocases of spontaneous evolution of monomers to linear polymers having novel cross-laminated topology are reported. We synthesized two peptide monomers N 3 -Gly-Gly-NH-CH 2 -CCH and N 3 -Gly-Gly-Gly-CH 2 -CCH and solved their crystal structures by single-crystal X-raydiffraction. They adopt H-bonded crisscrossed layered packing in their crystals such that:( a) the monomers are aligned head-to-tail in 1Dchain-like arrays and parallel arrangement of such arrays forms al ayer;( b) the proximally placed azide and alkyne motifs are in an orientation apt for their regiospecific cycloaddition;( c) each monomer having xp eptide bonds is Hbonded with 2x monomers disposed in intersecting arrangement, which pre-organize1 D-chain-like arrays in adjacent layers in perpendicular orientation. These crystals underwent spontaneous single-crystal-to-single-crystal (SCSC) polymerization via azide-alkyne cycloaddition reaction to form triazolyl-polyglycines,a tr oom temperature.T he crisscrossed arrangement of monomers in adjacent layers ensured the formation of cross-laminated polymers.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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Amino acids and poly(amino acids) as nucleating agents for poly(lactic acid)

Cited by 20 publications

References 35 publications

Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(l-lactic acid)

Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(l-lactic acid)

Non-Isothermal Crystallization Kinetics of Green Microalgae Filled Poly(Lactic Acid)

Spontaneous Single‐Crystal‐to‐Single‐Crystal Evolution of Two Cross‐Laminated Polymers

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