Lignin functions as an effective reinforcing filler for natural rubber (NR), when it was mixed with NR latex by the soft processing method. The lignin was aggregated, but localized around rubber particles in the NR latex to form a network-like structure of lignin in the NR matrix after drying. The observation clearly showed the role of filler networks for the excellent reinforcement of rubber in the case of organic filler similarly to inorganic fillers.
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Phakkeeree et al. (2016) studied this question.
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