Thermal Properties and Dynamic Characteristics of Electrospun Polylactide/Natural Rubber Fibers during Disintegration in Soil.

Yulia V Tertyshnaya,Maksim N Moskovskiy,Maria V Podzorova,Svetlana G Karpova,Anatoliy V Khvatov

doi:10.3390/polym14051058

Yulia V Tertyshnaya, Maksim N Moskovskiy + Show 3 more

Open Access

https://doi.org/10.3390/polym14051058

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Journal: Polymers	Publication Date: Mar 7, 2022
Citations: 11	License type: CC BY 4.0

Affiliation: Federal Scientific Agroengineering Center VIM

Abstract

In this work, PLA/NR electrospun fibers were used as substrates for growing basil. Thermal characteristics of initial samples and after 60 and 220 days of degradation were determined using differential scanning calorimetry. In the process of disintegration, the melting and glass transition temperatures in PLA/NR composites decreased, and in PLA fibers these values increased slightly. TGA analysis in an argon environment confirmed the effect of NR on the thermal degradation of PLA/NR fibers. After exposure to the soil for 220 days, the beginning of degradation shifted to the low-temperature region. The dynamic characteristics of the fibers were determined by the EPR method. A decrease in the correlation time of the probe-radical in comparison with the initial samples was shown. FTIR spectroscopy was used to analyze the chemical structure before and after degradation in soil. In PLA/NR fibrous substrates, there was a decrease in the intensity of the bands corresponding to the PLA matrix and the appearance of N-H C-N groups due to biodegradation by soil microorganisms.

Highlights

IntroductionGrowing concerns about environmental protection and partial refusal of petroleumbased polymers led to the invention of bio-based polymers [1,2]
$ = 1.24 g/cm3 and molecular weight (Mw ) of 1.7 × 105 g/mol was procured from Nature
This fact is studied and discussed in papers example, show non-woven materials made of pure contentFigure of 15 1 show wt.%. non-woven materials made of pure PLA and PLA/natural rubber (NR) with an NR content of 15 wt.%

Summary

Introduction

Growing concerns about environmental protection and partial refusal of petroleumbased polymers led to the invention of bio-based polymers [1,2]. Eco-friendly polymers such as poly-3-hydroxybutyrate, polycaprolactone and polylactide are actively being introduced into today’s world [3–5]. Fibrous materials based on PLA can serve as covering materials for growing new experimental varieties in breeding and seed production or serve as substrates for growing various crops [6]. Modern trends focused on eco-friendly technologies are leading to increasing use of biodegradable materials in agricultural production. This is especially true for crop production, which uses covering and mulching polymer materials, a significant part of which enters the soil directly during their use, bypassing the stages of collection, sorting and processing

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