Thermo-oxidative decomposition behavior of starch-g-poly(citronellyl methacrylate) and starch-g-poly(citronellyl acrylate) copolymers

Marta Worzakowska

doi:10.1007/s10973-017-6950-8

Abstract

The paper describes the studies on the thermo-oxidative decomposition behavior of two types of starch graft copolymers: starch-g-poly(citronellyl acrylate) copolymers with the grafting percent (%G): 21.3% ± 0.5, 35.8% ± 0.6 and 59.8% ± 0.3 and starch-g-poly(citronellyl methacrylate) copolymers with %G: 21.3% ± 0.4, 37.0% ± 0.2 and 51.8% ± 0.3 prepared applying the “grafting from” method. The decomposition course of copolymers by using the TG/DTG/DSC/FTIR analysis was evaluated. As it was found, the course of TG/DTG/DSC curves was independent on the %G but it was directly dependent on the type of analyzed copolymer. It resulted in completely different decomposition course of starch-g-poly(citronellyl acrylate) copolymers under the presence of oxidative conditions as compared to starch-g-poly(citronellyl methacrylate) copolymers. Thanks to applying the FTIR analysis of the gaseous products emitted under the heating of the studied materials, the detailed decomposition course of copolymers was evaluated.

Highlights

Starch is an environmentally friendly, carbohydrate, macromolecular compound which finds it applications in many field of industry such as a food, pharmaceutical, medicine and paper industries
Due to the fact that those copolymers were characterized by promising physicochemical properties and thermal stability which acted them as attractive materials for the preparation of more environmentally friendly products which could replace petrochemical plastics, we decided to continue our studies on the chemical modification of starch by other methacrylate and acrylate monomers
The present paper describes the thermal properties and the studies on the evaluation of decomposition course of two types of novel materials: starch-g-poly(citronellyl methacrylate) and starch-gpoly(citronellyl acrylate) copolymers which differ in their grafting percent (%G)

Summary

Introduction

Starch is an environmentally friendly, carbohydrate, macromolecular compound which finds it applications in many field of industry such as a food, pharmaceutical, medicine and paper industries. At the Department of Polymer Chemistry UMCS, the intensive studies on the synthesis, physicochemical properties and thermal behavior of novel, non-described in the literature data, starch-g-copolymers are conducted. To this time, we succeed in the preparation the starch-gcopolymers based on aromatic methacrylate and acrylate monomers such as phenyl and benzyl meth(acrylates). We succeed in the preparation the starch-gcopolymers based on aromatic methacrylate and acrylate monomers such as phenyl and benzyl meth(acrylates) The studies of their properties affirmed that the decomposition course of those copolymers is complex and leads to the formation of the mixture of volatile products and covered series, simultaneous processes [22–26]. Applying the monomers prepared from methacryloyl or acryloyl chloride and natural terpene alcohol: citronellol allowed obtaining

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Conclusion