Physical and Mechanical Properties and the Process of Biodegradabilityof Modified Sack Paper

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UDС

676.26

DOI:

10.17238/issn0536-1036.2017.5.150

Abstract

The paper studies the mechanical properties unmodified and modified sack paper (with the surface treatment with starch or polylactide coatings and unipolar (negative) corona discharge) and the process of their biodegradability. The polymer coating is applied by a solution method; the processing in the negative corona discharge field is carried out with a volt-age of 30 kV applied to the electrode for 30 seconds. The study of sack paper shows an in-crease of its strength characteristics when applying polymer coatings. The strength in the longitudinal (machine) direction decreases slightly and increases in the transverse direction after the processing of pulp and paper materials in the field of negative corona discharge. The decrease of mechanical properties is due to the fibers weakening because of the destruction of cellulose macromolecules, and the strength enhancement is due to the hardening of the bonding strength between the fibers. Biodegradability of pulp and paper materials is determined by the aerobic decomposition method (composting, when the decomposition of organic substances proceeds with the consumption of free oxygen or air). Sack paper completely decomposes after 3 months. When a polylactide coating is applied on it, the biodeg-radation period is reduced to 2.5 months, for the starch coating - 1.5 months. The processing of pulp-and-paper materials in corona discharge accelerates the process of biodegradation: for sack paper and paper with starch coating ? up to 1.5 months, for paper with polylactide coating - up to 2 months.

Authors

A.I. Nazmieva, Postgraduate Student
M.F. Galikhanov, Doctor of Engineering Sciences, Professor
L.R. Musina, Candidate of Engineering Sciences

Affiliation

Kazan National Research Technological University, ul. K. Marksa, 68, Kazan, Republic of Tatarstan, 420015, Russian Federation; е-mail: mgalikhanov@yandex.ru, L.musina@yandex.ru, nazmievaalsu@yandex.ru

Keywords

sack paper, polylactide, starch, unipolar corona discharge, biodegradability

For citation

Nazmieva A.I., Galikhanov M.F., Musina L.R. Physical and Mechanical Prop-erties and the Process of Biodegradability of Modified Sack Paper. Lesnoy zhurnal [Forestry journal], 2017, no. 5, pp. 150–158. DOI: 10.17238/issn0536-1036.2017.5.150

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Received on April 02, 2017