Novel Method of Incorporating Silver Nanoparticles into Natural Rubber Latex Foam

Abstract Low molecular-weight natural rubber (LNR) and LNR latex was prepared by oxidative degradation of de-proteinized natural rubber (DPNR) latex in the presence of 1 phr of K2S2O8 and 15 phr of propanal, by shaking at 60 °C. The intrinsic viscosity [η] of DPNR with only K2S2O8 decreased from 7.2 to 5.5 after 2 h and then increased to 6.5 after 3 h. By the addition of propanal, DPNR showed a significant decrease in the [η] value of LNR with [η] of about 0.5 after 5 h of the reaction, while rubber from high-ammonia natural rubber (HANR) latex showed a slight decrease in [η]. The concentration of latex and the kind of surfactant used for stabilizing the latex had little effect on the degradation rate of DPNR latex. The LNR latex is stable as the latex form and the dried rubber coagulated from latex is transparent and colorless. The LNR was a telechelic polymer containing aldehyde and ketone groups at both terminals as determined by NMR and molecular weight analyses.

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PMMA particles coated with chitosan-silver nanoparticles as a dual antibacterial modifier for natural rubber latex films

Colloids and Surfaces B Biointerfaces ◽

10.1016/j.colsurfb.2018.11.037 ◽

2019 ◽

Vol 174 ◽

pp. 544-552 ◽

Cited By ~ 7

Author(s):

Teeraporn Suteewong ◽

Jitrada Wongpreecha ◽

Duangporn Polpanich ◽

Kulachart Jangpatarapongsa ◽

Chariya Kaewsaneha ◽

...

Keyword(s):

Silver Nanoparticles ◽

Natural Rubber ◽

Natural Rubber Latex ◽

Latex Films ◽

Rubber Latex ◽

Pmma Particles

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A novel method to crosslink natural rubber latex adhesive at ambient temperature

Polymer Bulletin ◽

10.1007/s00289-014-1264-5 ◽

2014 ◽

Vol 72 (1) ◽

pp. 135-155 ◽

Cited By ~ 5

Author(s):

Bencha Thongnuanchan ◽

Rattanawadee Ninjan ◽

Azizon Kaesaman ◽

Charoen Nakason

Keyword(s):

Natural Rubber ◽

Ambient Temperature ◽

Natural Rubber Latex ◽

Rubber Latex ◽

Novel Method

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Effects of silver nanoparticles on physical and antibacterial properties of natural rubber latex foam

Materials Today Proceedings ◽

10.1016/j.matpr.2019.06.230 ◽

2019 ◽

Vol 17 ◽

pp. 1914-1920 ◽

Cited By ~ 1

Author(s):

Khemara Mam ◽

Rapeephun Dangtungee

Keyword(s):

Silver Nanoparticles ◽

Natural Rubber ◽

Natural Rubber Latex ◽

Antibacterial Properties ◽

Rubber Latex

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The Role of Ammonia in Synthesis of Silver Nanoparticles in Skim Natural Rubber Latex

Journal of Nanoscience ◽

10.1155/2016/7258313 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Panu Danwanichakul ◽

Thanawat Suwatthanarak ◽

Chidchanok Suwanvisith ◽

Duangkamol Danwanichakul

Keyword(s):

Silver Nanoparticles ◽

Natural Rubber ◽

Natural Rubber Latex ◽

Ammonia Concentration ◽

Rubber Latex ◽

Controlling Effect ◽

Uv Visible ◽

Size Controlling ◽

Latex Production

Silver nanoparticles (AgNPs) were synthesized in skim natural rubber latex, the by-product from concentrated latex production. The role of ammonia was investigated by varying the concentration to be 0.217, 0.362, 0.377, 0.392, and 0.406 wt%. The emergence of AgNPs was detected by UV-visible spectrophotometer and electrical conductivity meter. Upon increasing ammonia concentration, the ABS peak increased to a maximum and slightly shifted to a higher wavelength and then it decreased afterward and slightly shifted to a lower wavelength. The shift of the ABS peak was consistent with the conductivity result. The kinetic model was proposed to explain the competition between the reducing effect and size-controlling effect of ammonia. The reducing effect seemed to dominate in the low range of concentration while the size-controlling effect via the formation of AgNH32+ complex ion was important in the higher range. The TEM figures evidently confirmed the effects.

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