Crystallization and Thermal Properties

Fambri, Luca; Migliaresi, Claudio

doi:10.1002/9781119767480.ch8

Cited by 5 publications

(3 citation statements)

References 146 publications

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“…5,6 Extending its temperature range of applications requires that the polymer crystallizes, but its crystallization rate is much slower than the cooling rates employed during processing. 7,8 A successful strategy to enhance polymer crystallization rate is the use of particular additives, known as nucleating agents (NAs), 9 which provide active seeds for the onset of the crystallization process. Due to its practical relevance, several compounds have been already tested as nucleating agents for PLLA.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of symmetric bis-α-ketoamides from renewable starting materials and comparative study of their nucleating efficiency in PLLA

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Synthesis of symmetric bis-α-ketoamides from renewable starting materials and comparative study of their nucleating efficiency in PLLA

et al. 2023

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“…PCL is synthesized from a ring-opening mechanism using a catalyst [ 9 ]. However, PCL/PLA blends present mechanical problems at elevated temperatures due to the slow crystallization rate of PLA, which is related to the enantiomeric mixture of the major component (the L isomer) and the glass transition temperature, which usually ranges between 55 and 65 °C [ 10 , 11 ]. Therefore, research to counteract this drawback of mixtures has focused on the addition of ceramic nano-fillers, i.e., inorganic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Biocompatibility Assessment of Polycaprolactone/Polylactic Acid/Zinc Oxide Nanoparticle Composites under In Vivo Conditions for Biomedical Applications

Castro,

Araujo-Rodríguez,

Valencia-Llano

et al. 2023

Pharmaceutics

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The increasing demand for non-invasive biocompatible materials in biomedical applications, driven by accidents and diseases like cancer, has led to the development of sustainable biomaterials. Here, we report the synthesis of four block formulations using polycaprolactone (PCL), polylactic acid (PLA), and zinc oxide nanoparticles (ZnO-NPs) for subdermal tissue regeneration. Characterization by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) confirmed the composition of the composites. Additionally, the interaction of ZnO-NPs mainly occurred with the C=O groups of PCL occurring at 1724 cm−1, which disappears for F4, as evidenced in the FT-IR analysis. Likewise, this interaction evidenced the decrease in the crystallinity of the composites as they act as crosslinking points between the polymer backbones, inducing gaps between them and weakening the strength of the intermolecular bonds. Thermogravimetric (TGA) and differential scanning calorimetry (DSC) analyses confirmed that the ZnO-NPs bind to the carbonyl groups of the polymer, acting as weak points in the polymer backbone from where the different fragmentations occur. Scanning electron microscopy (SEM) showed that the increase in ZnO-NPs facilitated a more compact surface due to the excellent dispersion and homogeneous accumulation between the polymeric chains, facilitating this morphology. The in vivo studies using the nanocomposites demonstrated the degradation/resorption of the blocks in a ZnO-NP-dependant mode. After degradation, collagen fibers (Type I), blood vessels, and inflammatory cells continue the resorption of the implanted material. The results reported here demonstrate the relevance and potential impact of the ZnO-NP-based scaffolds in soft tissue regeneration.

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“…It is reported that PLA with PLLA content higher than 90% tends to be crystalline. The PLA molecular chains in crystal region are arranged regularly, which is conducive to improving barrier and mechanical properties and delaying degradation rate. − Moreover, some commercial products have already demonstrated the application of PLA as a direct-contacting material. , For example, it has been used for manufacturing food or beverage containers, such as cooked lunch, fresh food, yogurts, and bottled juices . Also, straws made from PLA take the place of plastic or paper ones of beverage shops, bringing convenience for customers and achieving environment protection.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning of PLA Nanofibers: Recent Advances and Its Potential Application for Food Packaging

Wang

et al. 2022

J. Agric. Food Chem.

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Poly(lactic acid), also abbreviated as PLA, is a promising biopolymer for food packaging owing to its environmental-friendly characteristic and desirable physical properties. Electrospinning technology makes the production of PLA-based nanomaterials available with expected structures and enhanced barrier, mechanical, and thermal properties; especially, the facile process produces a high encapsulation efficiency and controlled release of bioactive agents for the purpose of extending the shelf life and promoting the quality of foodstuffs. In this study, different types of electrospinning techniques used for the preparation of PLA-based nanofibers are summarized, and the enhanced properties of which are also described. Moreover, its application in active and intelligent packaging materials by introducing different components into nanofibers is highlighted. In all, the review establishes the promising prospects of PLA-based nanocomposites for food packaging application.

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Crystallization and Thermal Properties

Cited by 5 publications

References 146 publications

Synthesis of symmetric bis-α-ketoamides from renewable starting materials and comparative study of their nucleating efficiency in PLLA

Synthesis of symmetric bis-α-ketoamides from renewable starting materials and comparative study of their nucleating efficiency in PLLA

Biocompatibility Assessment of Polycaprolactone/Polylactic Acid/Zinc Oxide Nanoparticle Composites under In Vivo Conditions for Biomedical Applications

Electrospinning of PLA Nanofibers: Recent Advances and Its Potential Application for Food Packaging

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