The Effects of Inorganic Salts with Different Anions on the Structure and Properties of Starch/Poly (Butylene Succinate) Blends Plasticized with Ionic Liquid.

Zhixin Zhao,Wenhao Du,Xi Zhang,Bei Lei

doi:10.3390/polym11122004

Abstract

1-butyl-3-methylimidazole chloride ((BMIM) Cl) modified starch/poly (butylene succinate) (PBS) blends with different anions of inorganic salts were prepared by HAAKE mixer. The compatibility and thermal behaviors including crystallinity, crystallization and melting temperature, thermal stability and mechanical properties were systematically investigated by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The results show that inorganic salts can produce a strong interaction with starch/PBS blends, which can improve the mechanical properties of starch/PBS blends, enhance the mechanical strength and elongation at break of starch/PBS blends, meanwhile, the thermal stability of starch/PBS blends decreased. The SEM images reveal that the compatibility of starch/PBS become better with the increase of inorganic salts. The melting and crystallization absorption peaks in the DSC curves show that the melting enthalpy (ΔHm), crystallinity (Xc), and crystallization temperature (Tc) of the blends decrease and the cold crystallization temperature (Tcc) increase when inorganic salts is added. Moreover, inorganic salts with smaller anionic radius have much better effects on the starch/PBS blends plasticized with ((BMIM)Cl).

Highlights

As the continuous consumption of petroleum resources of raw materials for the preparation of polymer materials, and the increasing emphasis on environmental pollution caused by the difficult degradation of waste polymer materials, the development of eco-friendly polymer materials based on natural and non-petroleum resources has been greatly concerned by the governments and scientific research institutions all over the world [1,2,3]
The interaction between anion and cation of inorganic salts and the hydroxy(-OH) of starch and PBS is the main interaction between inorganic salts and TSP composite
The TSP sample without any addition of inorganic salt shows a peak at 3411 cm−1 which corresponds to the stretching vibration absorption peak of starch and PBS molecular chains [30], a peak at 1084 cm−1 corresponds to the stretching vibration peak of C–O in the C–O–H group of the starch molecules, and a peak at

Summary

Introduction

As the continuous consumption of petroleum resources of raw materials for the preparation of polymer materials, and the increasing emphasis on environmental pollution caused by the difficult degradation of waste polymer materials, the development of eco-friendly polymer materials based on natural and non-petroleum resources has been greatly concerned by the governments and scientific research institutions all over the world [1,2,3]. Polylactic acid (PLA) [4,5,6], polycaprolactone (PCL) [7,8,9], and poly(3-hydroxybutyrate) (PHB) [10,11,12] are typical biodegradable aliphatic polyesters, PBS stands out for the excellent performance and good industrial applications, such as eco-friendly nature, excellent properties in terms of biodegradability, processability, thermal properties and chemical resistance, and becomes one of the fastest growing varieties [13,14,15]. Starch is a highly abundant, non-toxic, and renewable biopolymer, which is produced from assimilating plants. It is extensively utilized in various fields, such as food, paper, wood, and pharmaceutical industry [16,17,18,19], and starch gradually becomes the main green chemical raw materials [20,21,22].

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Conclusion