Open AccessMolecular Weight of Liquid Natural Rubber (LNR) Product from the Chemical Depolymerization Process of High Molecular Weight Narutal Rubber Latex
Author(s) -
Bahruddin,
Ivan Fadhillah,
_ Septian,
Arya Wiranata,
Ida Zahrina
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1655/1/012091
Subject(s) - depolymerization , natural rubber , catalysis , size exclusion chromatography , molar mass distribution , chemistry , polymer chemistry , materials science , organic chemistry , polymer , enzyme
The molecular weight of natural rubber varies greatly, from only a few hundred thousand to more than one million. Liquid natural rubber (LNR) products generally use natural rubber in the form of latex with a relatively low molecular weight, which ranges from a molecular weight of 600,000 g / mol. This study aims to determine the molecular weight of LNR products made from the chemical depolymerization process of natural rubber latex with a molecular weight of more than one million. The natural rubber used latex with 20% Dry Rubber Content (KKK). The natural rubber depolymerization process used NaNO 2 and H 2 O 2 degrading agents with a CoCl 2 catalyst at 80 °C. H 2 O 2 levels were kept constant at 1 parts per hundred rubber (phr), and NaNO 2 levels vary at 0; 2; 3; and 4 phr. After the reactor temperature reaches 80°C, the CoCl 2 catalyst was added, which level varied at 0; 1; 3; and 5 phr. The reaction time was varied, which 7, 8, and 9 hours. The results of LNR product was purified to form a semi-gel, and molecular weight was analyzed using gel permeable chromatography (GPC). The results showed that the lowest molecular weight of the resulting LNR product was 108,335 g / mol from the initial molecular weight of 1,384,638 g / mol.