DIFFUSION OF LONG CHAINS THROUGH A POROUS THIN GEL NETWORK

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DIFFUSION OF LONG CHAINS THROUGH A POROUS THIN GEL NETWORK

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- DIFFUSION OF LONG CHAINS THROUGH A POROUS THIN GEL NETWORK
- Issue 5, Pages: 441-445(2007)
- Affiliations：
  
  1. The Hefei National Laboratory for Physical Sciences at Microscale Department of Chemical Physics The University of Science and Technology of China
  2. Hefei 230026
- Author bio：
- Funds：
  
  This work was financially supported by the Hong Kong Special Administration Region Earmarked（Grants No.CUHK4025/04P,2160242）();the Chinese Academy of Sciences（Special Grant KJCX2-SW-H14）();the National Natural Science Foundation of China（Key Grant 20574065）.()
- DOI：
  CLC： O648.1
- Published：2007
- Accepted：
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[1]张广照.DIFFUSION OF LONG CHAINS THROUGH A POROUS THIN GEL NETWORK[J].Chinese Journal of Polymer Science,2007(05):441-445.

DIFFUSION OF LONG CHAINS THROUGH A POROUS THIN GEL NETWORK[J]. 2007, (5): 441-445.
[1]张广照.DIFFUSION OF LONG CHAINS THROUGH A POROUS THIN GEL NETWORK[J].Chinese Journal of Polymer Science,2007(05):441-445. DOI：

DIFFUSION OF LONG CHAINS THROUGH A POROUS THIN GEL NETWORK[J]. 2007, (5): 441-445. DOI：

摘要

<正>Using a core（142 nm）made of linear polystyrene（PS）chains as a seed

we further polymerized a thin layer of cross-linked PS shell（7 nm）on it in water to form a core-shell particle.Such a particle swells in toluene

which enables linear PS chains inside the core to gradually diffuse out through the porous shell.Using a combination of static and dynamic laser light scattering

we examined the chain diffusion process by following the change of the scattering intensity（i.e.the average molar mass of the particles）.For the first time

we have revealed that the diffusion exhibits three stages.In the first stage

the chain diffusion through the shell is even faster than their translational diffusion in a dilute solution.The three stages respectively correspond to the change of the solution in the core from concentrated to semidilute and then from semidilute to dilute.

Abstract

Using a core（142 nm）made of linear polystyrene（PS）chains as a seed

we further polymerized a thin layer of cross-linked PS shell（7 nm）on it in water to form a core-shell particle.Such a particle swells in toluene

which enables linear PS chains inside the core to gradually diffuse out through the porous shell.Using a combination of static and dynamic laser light scattering

we examined the chain diffusion process by following the change of the scattering intensity（i.e.the average molar mass of the particles）.For the first time

we have revealed that the diffusion exhibits three stages.In the first stage

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