研究目的
To obtain liquid natural rubber via photodegradation, with titanium dioxide nanocrystals as the catalyst, to reduce the molecular weight of natural rubber and introduce hydroxyl and carbonyl groups on the liquid natural rubber chains.
研究成果
Functionalized liquid natural rubber was successfully prepared via photodegradation catalyzed by TiO2 anatase nanocrystals. The molecular weight of natural rubber was significantly reduced, and hydroxyl and carbonyl groups were introduced on the liquid natural rubber chains. The presence of TiO2 increased the efficiency of the photodegradation process.
研究不足
The study was limited by the potential for side reactions such as crosslinking and chain reconnecting when high amounts of TiO2 nanocrystals were used. The desorption of TiO2 nanocrystals from the latex surface during photodegradation and its implications were not fully explored.
1：Experimental Design and Method Selection:
The study involved the synthesis of TiO2 nanocrystals via the sol–gel method and their use as a photocatalyst in the photodegradation of natural rubber latex under UV light.
2：Sample Selection and Data Sources:
Low-ammonia natural rubber latex (LATZ) was used as the starting material.
3：List of Experimental Equipment and Materials:
Titanium (IV) isopropoxide (TTIP), nitric acid (HNO3), isopropanol, hydrogen peroxide, methanol, sodium dodecyl sulphate (SDS), and toluene were used. Equipment included XRD, TEM, GPC, FTIR spectrometer, NMR spectrometer, and SEM.
4：Experimental Procedures and Operational Workflow:
TiO2 was synthesized and characterized. NR latex was mixed with SDS and TiO2, then exposed to UV light in the presence of hydrogen peroxide. The degraded latex was coagulated, washed, and dried.
5：Data Analysis Methods:
Molecular weights were determined by GPC, structure by FTIR and NMR spectroscopy, and morphology by SEM and TEM.
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