How the Aggregates Determine Bound Rubber Models in Silicone Rubber? A Contrast Matching Neutron Scattering Study

Li-Zhao Huang; Yue Shui; Wei Chen; Zhong-Ming Li; Hong-Tao Song; Guang-Ai Sun; Jia-Zhuang Xu; Gan-Ji Zhong; Dong Liu

doi:10.1007/s10118-020-2485-8

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How the Aggregates Determine Bound Rubber Models in Silicone Rubber? A Contrast Matching Neutron Scattering Study

ARTICLE | Updated：2020-09-21

- How the Aggregates Determine Bound Rubber Models in Silicone Rubber? A Contrast Matching Neutron Scattering Study
- Chinese Journal of Polymer Science Vol. 39, Issue 3, Pages: 365-376(2021)
- Affiliations：
  
  a.Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry (INPC), China Academy of Engineering Physics (CAEP), Mianyang 621999, China
  b.National Synchrotron Radiation Lab, CAS Key Laboratory of Soft Matter Chemistry, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, University of Science and Technology of China, Hefei 230026, China
  c.College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  guangaisun_80@163.com (G.A.S)
  dongliu10@mail.ustc.edu.cn (D.L.)
- Funds：
- DOI：10.1007/s10118-020-2485-8
  CLC：
- Received：20 June 2020，
  
  Revised：2020-7-22，
  
  Accepted：27 July 2020，
  
  Online First：21 September 2020，
  
  Published：02 January 2021
- Accepted：
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Huang, L. Z.; Shui, Y.; Chen, W.; Li, Z. M.; Song, H. T.; Sun, G. A.; Xu, J. Z.; Zhong, G. J.; Liu, D. How the aggregates determine bound rubber models in silicone rubber? A contrast matching neutron scattering study. Chinese J. Polym. Sci. 2021, 39, 365–376

Li-Zhao Huang, Yue Shui, Wei Chen, et al. How the Aggregates Determine Bound Rubber Models in Silicone Rubber? A Contrast Matching Neutron Scattering Study[J]. Chinese Journal of Polymer Science, 2021, 39(3): 365-376.
Huang, L. Z.; Shui, Y.; Chen, W.; Li, Z. M.; Song, H. T.; Sun, G. A.; Xu, J. Z.; Zhong, G. J.; Liu, D. How the aggregates determine bound rubber models in silicone rubber? A contrast matching neutron scattering study. Chinese J. Polym. Sci. 2021, 39, 365–376 DOI： 10.1007/s10118-020-2485-8.

Li-Zhao Huang, Yue Shui, Wei Chen, et al. How the Aggregates Determine Bound Rubber Models in Silicone Rubber? A Contrast Matching Neutron Scattering Study[J]. Chinese Journal of Polymer Science, 2021, 39(3): 365-376. DOI： 10.1007/s10118-020-2485-8.

摘要

Abstract

The correlation between aggregates and bound rubber structures in silicone rubbers (S(phr)) with various silica fractions (

) has been investigated by contrast matching small-angle neutron scattering (SANS)

swelling kinetics

and low-field nuclear magnetic resonance (NMR). Mixed solvents with deuterated cyclohexane fractions of 4.9% and 53.7% were chosen to match the scattering length densities of the matrix (S

(phr)) and the filler (S

(phr))

respectively. All the data consistently suggest that: (i) There is a critical threshold

between 10 and 30 phr; below

the isolated aggregates are dominant

while beyond

some rubber fraction is trapped among the agglomerate; (ii)

-independent thicknesses around 7.5 nm (NMR) and 8.6 nm (SANS) suggest that the bound rubber formation is determined by inherent properties of the components

and the power-law around 4.2 suggests an exponential changed gradient density of the bound rubber; (iii) S

(80) presents a bicontinuous bound rubber with three characteristic lengths of 41

100

and 234 nm. The expanded correlation length

a 20 nm smaller aggregate sizes suggest that such existent bicontinuous network in dry samples with less

is kind of impacted by swelling. With the obtained bound rubber models

the reinforcing mechanism of filled silicone rubber is elucidated.

关键词

Keywords

references

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