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INTERNATIONAL JOURNAL OF PHARMACEUTICAL RESEARCH

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IJPR included in UGC-Approved List of Journals - Ref. No. is SL. No. 4812 & J. No. 63703

Published by : Advanced Scientific Research
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0975-2366
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IJPR 9[3] July - September 2017 Special Issue

July - September 9[3] 2017

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Characteristics of the Glucomannan - Modified Cassava Starch Biothermoplastic Composites on the Variety of Types and Concentrations of Reinforcing Materials

Author: BAMBANG ADMADI HARSOJUWONO, AMNA HARTIATI, SAYI HATININGSIH
Abstract: The research objectives were to determine the type and concentration of reinforcing materials that produced the best characteristics of glucomannan-modified cassava starch biothermoplastic composite. This study used a factorial randomized block design with two factors. The first factor was the type of reinforcing materials with 4 levels, namely polyvinyl alcohol, diphenylmethane diisocyanate, polyurethane polyester and polyepoxide. The second factor was the concentration of the reinforcing materials which consisted of 3 levels, namely 1.5, 3.0, 4.5 % w/w, so that there were 12 combination treatments. Each treatment combination was grouped into 4 based on the processing time of the biothermoplastic composite. The variables observed were melting and gluing capability, tensile strength, elongation at break, Young Modulus, swelling, degradation time, surface profiles and functional groups. The results showed that polyvinyl alcohol and diphenylmethane diisocyanate formed biothermoplastic composites from the modified cassava starch - glucomannan, meanwhile polyester polyurethane and polyepoxide formed biothermoset composites from the glucomannan - modified cassava starch. The glucomannan - modified cassava starch biothermoplastic composite using 4.5 % polyvinyl alcohol have the best characteristics, namely having excellent melting and gluing capability with the tensile strength value of 2062.23 MPa, elongation at break of 8.10 %, Young 'modulus of 25,428.31 MPa, swelling of 10.72 %, biodegradation time of 5.25 days, the transverse surface profile did not show any clear holes (pores) and fibers, the longitudinal surface profile did not show the presence of waves, fine fibers or pores and contained functional groups (OH), (CH) and (-(CH2)n). The glucomannan - modified cassava starch biothermoplastic composites using polyvinyl alcohol of 4.5% have met the PLA plastic standards from Japan, the international plastic standards ASTM 5336, the PCL plastic standards from the UK and the ISO 527/1B international plastic standards, but some of them meet the Indonesian National Standards (SNI), but it has not met the international plastic standards EN 317.
Keyword: biothermoplastic composites, modified cassava starch, glucomannan, type and concentration, reinforcing material
DOI: https://doi.org/10.31838/ijpr/2021.13.02.143
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