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Highly aging-resistant elastomers doped with antioxidant-loaded clay nanotubes
Ye Fu, Detao Zhao, Pengjun Yao
1§Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71270, United States.
ACS Applied Materials & Interfaces
|April 9, 2015
Summary
This study introduces a new aging-resistant styrene-butadiene rubber (SBR) composite using halloysite nanotubes filled with antioxidant 4010NA. This innovative approach provides sustained antioxidant release and improved rubber durability.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Styrene-butadiene rubber (SBR) is prone to degradation from thermal-oxidative aging.
- Traditional antioxidants can suffer from poor dispersion and premature loss (blooming) in rubber matrices.
- Halloysite clay nanotubes offer a potential solution for controlled release of additives.
Purpose of the Study:
- To develop an aging-resistant SBR composite using halloysite nanotubes as a carrier for antioxidants.
- To investigate the sustained release properties and anti-blooming effects of antioxidants encapsulated in halloysite.
- To evaluate the impact of silanized halloysite on the miscibility and mechanical properties of SBR composites.
Main Methods:
- Antioxidant N-isopropyl-N -phenyl-p-phenylenediamine (4010NA) was loaded into halloysite clay nanotubes.
- Silanization of halloysite was performed to improve its compatibility with the SBR matrix.
- SBR composites containing modified halloysite were prepared and subjected to thermal-oxidative aging tests (90 °C for 7 days).
- Mechanical properties were assessed before and after aging to determine aging resistance.
Main Results:
- Sustained release of 4010NA from halloysite nanotubes was observed for up to nine months.
- The concentration of antioxidant in the SBR nanoformulation was tripled without causing blooming defects.
- Silanization enhanced the miscibility of halloysite within the SBR matrix.
- SBR composites with 27 wt% halloysite loaded with 4010NA exhibited preserved mechanical properties after aging.
- No antioxidant blooming was observed even after one month of testing.
Conclusions:
- Halloysite nanotubes effectively serve as a sustained-release system for antioxidants in SBR.
- Silanized halloysite improves the performance and processability of SBR composites.
- The developed SBR-halloysite composite demonstrates significantly enhanced aging resistance.
- Halloysite shows promise as a functional filler for improving the durability of rubber materials.
