Chemical Properties of Poly(lactic Acid)

Sin, Lee Tin; Rahmat, Abdul Razak; Rahman, Wan Aizan Wan Abdul

doi:10.1016/b978-1-4377-4459-0.00004-4

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…Figure A shows the infrared spectra of PLA, ESOME, and PPLA. PLA presents the characteristic bands associated with the C–H stretching (3000–2850 cm –1 ) and bending (1450 cm –1 ) frequencies of CH 3 groups, and the carbonyl stretching (1746 m –1 ) and bending modes (1267 cm –1 ) characteristics of ester groups (Figure B) . On the other hand, ESOME presented similar chemical bonds, but its peaks appeared at slightly different position together with a new peak centered at 825 cm –1 (Table S1), associated with the presence of the epoxide group, absent in PLA (Figure B).…”

Section: Resultsmentioning

confidence: 98%

Biodegradable and Biobased Mulch Films: Highly Stretchable PLA Composites with Different Industrial Vegetable Waste

Merino

Żych

Athanassiou

2022

ACS Appl. Mater. Interfaces

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Highly stretchable biobased and biodegradable agricultural mulch films based on polylactic acid (PLA) and 10, 20, or 30 wt % various nonedible vegetable wastes such as spinach stems (SS), tomato pomace (TP), and cocoa shells (CS) are prepared and characterized in this work. The results demonstrate that appropriate PLA plasticization and vegetable waste addition allow for obtaining films suitable for mulching with tensile strengths in the 10–24 MPa range and elongations at break up to 460%, depending on the kind and amount of vegetable waste incorporated. Additionally, the developed mulches show low water solubility (1–15 wt %) and moisture content (1–3 wt %) with a water vapor permeability of up to 3 × 10–10 g s–1 m–1 Pa–1, similar to that of Mater-Bi. In addition, the type of vegetable waste added as filler were demonstrated to significantly affect not only the films’ mentioned properties but also their biodegradability. For instance, films prepared with 20 wt % SS were demonstrated to improve PLA soil biodegradability, which increased from 0 to 38 wt % for PLA composites after 6 months of a soil burial experiment. Lastly, the developed composites contain different amounts of plant micro- and macronutrients, indicating their potential as fertilizers. The results found in this work represent a sustainable, fully biobased alternative to other mulches already in the market.

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Section: Resultsmentioning

confidence: 98%

Biodegradable and Biobased Mulch Films: Highly Stretchable PLA Composites with Different Industrial Vegetable Waste

Merino

Żych

Athanassiou

2022

ACS Appl. Mater. Interfaces

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“…For instance, it has been shown that D and mixed L/D forms have a higher degradability rate than the L form. Compared to other polymers, the chirality-based chemical capacity of polylactic acid (L, D, or L/D) leads to semi-permeable properties to water and oxygen, thus being more susceptible to biodegradation compared to other polymers used in the medical field [ 22 , 23 , 24 ]. Moreover, the degradation of PLA can be enhanced by enlarging the surface area ratio or by increasing the porosity of the polymer.…”

Section: Introductionmentioning

confidence: 99%

H2O2-PLA-(Alg)2Ca Hydrogel Enriched in Matrigel® Promotes Diabetic Wound Healing

et al. 2023

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Hydrogel-based dressings exhibit suitable features for successful wound healing, including flexibility, high water-vapor permeability and moisture retention, and exudate absorption capacity. Moreover, enriching the hydrogel matrix with additional therapeutic components has the potential to generate synergistic results. Thus, the present study centered on diabetic wound healing using a Matrigel-enriched alginate hydrogel embedded with polylactic acid (PLA) microspheres containing hydrogen peroxide (H2O2). The synthesis and physicochemical characterization of the samples, performed to evidence their compositional and microstructural features, swelling, and oxygen-entrapping capacity, were reported. For investigating the three-fold goal of the designed dressings (i.e., releasing oxygen at the wound site and maintaining a moist environment for faster healing, ensuring the absorption of a significant amount of exudate, and providing biocompatibility), in vivo biological tests on wounds of diabetic mice were approached. Evaluating multiple aspects during the healing process, the obtained composite material proved its efficiency for wound dressing applications by accelerating wound healing and promoting angiogenesis in diabetic skin injuries.

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