The effect of polyethylene glycol Mw 400 and 600 on stability of Shellac Waxfree

Khairuddin Khairuddin,F Clegg,A Zahrotul W,S B Utomo,V Wulandari,E Pramono

doi:10.1088/1742-6596/776/1/012054

Khairuddin Khairuddin, F Clegg + Show 4 more

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https://doi.org/10.1088/1742-6596/776/1/012054

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Abstract

The effect of polyethylene glycol (PEG) having molecular weight of 400 and 600 on stability of shellac waxfree prepared by solvent-evaporation method was reported in the present paper. The stability of shellac was tested by life under heat at 125 °C for 10,30,90, and 180 minutes. It was found that that stability of shellac decreased with heating time at 125 °C. PEG400 gave the most stable effect of shellac for 30 minutes of heating, whereas at 90 minutes and above PEG600 gave the most effect of shellac stability as shown by insoluble solid test and FTIR. The WVTR showed that water vapour barrier properties of PEG600/shellac was beter than that of PEG400/shellac system.

Highlights

Shellac is a natural polymer secreated by lac insects cultivated in host tree in tropical countries such as India, Thailand and Indonesia, which has been used in food, cosmetic, and pharmaceutical industry [1] .It is a complex mixture of single esters and polyesters containing hydroxyl and carboxyl [2] It is insoluble in water but solublene in alcohol and alkali solution [3]
It shows that the insoluble solid is presence in native shellac and in plasticized shellac indicating that Polyethylene glycol (PEG) could not stop polymerization
The amount of insoluble solid in both plasticized shellacs is lower that those of native shellac indicating that PEG400 and PEG600 slow down polymerization

Summary

Introduction

Shellac is a natural polymer secreated by lac insects cultivated in host tree in tropical countries such as India, Thailand and Indonesia, which has been used in food, cosmetic, and pharmaceutical industry [1] .It is a complex mixture of single esters and polyesters containing hydroxyl and carboxyl [2] It is insoluble in water but solublene in alcohol and alkali solution [3]. In our previous studies [8], it showed that PEG1000 gave better effect on shellac stability compared to that of PEG2000. The stability was tested by heating shellac for different times.

Results

Conclusion