Effect of Some Experimental Factors on Preparation of Liquid Natural Rubber

Abstract

The article presents results of effect of factors comprising the types of irradiation, the concentration of NR solution and the content of hydroperoxide in mixture on photochemical depolymerization of natural rubber. The results showed that the ultraviolet irradiation from the vapor mercury lamps (HSW-250W and HSW-125W) caused the faster rate of depolymerization than the light from HF-500W; increasing concentration of NR in toluene leaded to decrease the rate of depolymerization; and as the content of hydroperoxide increased the rate of depolymerization was faster. Additionally, the IR spectra, 13C-NMR of products were determined and showed that the cis-1,4-isoprene structure has not been changed and there was the presence of hydroxyl-terminated groups and a few epoxy groups in chains.

Functionalization of a liquid natural rubber by iron‐mediated radical chloro‐nitration and its thermal decomposition

“…By the photochemical method, the major chain of LNR was polyisoprene containing hydroxyl groups at termination and a little epoxy. 1,2 The LNR was applied for composite solid propellants [3][4][5][6] and polymer-bonded explosives as a binder of powder fillers (10-15%). 7 As an important advantage, the addition of the nitro groups (─NO 2 ) to chains of a polymer gives an energetic polymer.…”

“…Liquid natural rubber (LNR), which is a liquid unsaturated polymer, is made from natural rubber by several methods such as redox, photochemical, and oxidation routine. By the photochemical method, the major chain of LNR was polyisoprene containing hydroxyl groups at termination and a little epoxy 1,2 . The LNR was applied for composite solid propellants 3–6 and polymer‐bonded explosives as a binder of powder fillers (10–15%) 7 .…”