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186 results on '"Li, Si-Dong"'

29. Preparation and properties of natural rubber/chitosan microsphere blends.

Author

Lv Ming-zhe, Wang Li-feng, Fang Lei, Li Pu-wang, and Li Si-dong

Subjects
RUBBER, CHITOSAN, ANTIBACTERIAL agents, THERMOGRAVIMETRY, SCANNING electron microscopy
Abstract

Chitosan microspheres were prepared by ion induction and chemical cross-linking using water as the medium. Natural rubber/chitosan microsphere blends were then prepared by blending the chitosan microsphere suspension with natural rubber latex. An infrared spectrometer, particle size analyser, scanning electron microscope, surface contact angle analyser, thermogravimetric analyser, and differential scanning calorimeter were employed for structure and property characterisation. The results showed that the average particle diameter and the polydispersity index of chitosan microspheres were 323.8 nm and 0.283, respectively. The thermal stability and mechanical properties of natural rubber/chitosan blends were enhanced by introducing chitosan microspheres into natural rubber latex. The water contact angle was significantly decreased, from 94.64° to 55.47°, indicating improved hydrophilic properties for the natural rubber/chitosan film. The natural rubber/chitosan blends showed excellent antibacterial properties when the chitosan microsphere content was >4.00% w/w. [ABSTRACT FROM AUTHOR]

Published
2017
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32. Studies on the properties and the thermal decomposition kinetics of natural rubber prepared with calcium chloride

Author

Li, Chengpeng, Zhong, Jie-ping, Yang, Lei, Li, Si-dong, Kong, Lingxue, Hou, Ting-ting, Li, Chengpeng, Zhong, Jie-ping, Yang, Lei, Li, Si-dong, Kong, Lingxue, and Hou, Ting-ting

Abstract

To evaluate calcium chloride coagulation technology, two kinds of raw natural rubber samples were produced by calcium chloride and acetic acid respectively. Plasticity retention index (PRI), thermal degradation process, thermal degradation kinetics and differential thermal analysis of two samples studied. Furthermore, thermal degradation activation energy, pre-exponential factor and rate constant were calculated. The results show that natural rubber produced by calcium chloride possesses good mechanical property and poor thermo-stability in comparison to natural rubber produced by acetic acid.

Published
2010

38. Self-assembled natural rubber/silica nanocomposites : its preparation and characterization

Author

Peng, Zhen, Kong, Ling Xue, Li, Si-Dong, Chen, Yin, Huang, Mao Fang, Peng, Zhen, Kong, Ling Xue, Li, Si-Dong, Chen, Yin, and Huang, Mao Fang

Abstract

A novel natural rubber/silica (NR/SiO2) nanocomposite is developed by combining self-assembly and latex-compounding techniques. The results show that the SiO2 nanoparticles are homogenously distributed throughout NR matrix as nano-clusters with an average size ranged from 60 to 150 nm when the SiO2 loading is less than 6.5 wt%. At low SiO2 contents (less-than-or-equals, slant4.0 wt%), the NR latex (NRL) and SiO2 particles are assembled as a core-shell structure by employing poly (diallyldimethylammonium chloride) (PDDA) as an inter-medium, and only primary aggregations of SiO2 are observed. When more SiO2 is loaded, secondary aggregations of SiO2 nanoparticles are gradually generated, and the size of SiO2 cluster dramatically increases. The thermal/thermooxidative resistance and mechanical properties of NR/SiO2 nanocomposites are compared to the NR host. The nanocomposites, particularly when the SiO2 nanoparticles are uniformly dispersed, possess significantly enhanced thermal resistance and mechanical properties, which are strongly depended on the morphology of nanocomposites. The NR/SiO2 has great potential to manufacture medical protective products with high performances.

Published
2007

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