مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

Influence of Silica Nanolayers on the Water Diffusion through th


Influence of Silica Nanolayers on the Water Diffusion through the PMMA/Layered Silicate Nanocomposites

Akram Eyvazkhani, Mohammad Karimi

Abstract
In this work, sorption process of water in poly (methyl methacrylate) (PMMA) and its nanocomposites with Cloisite 30B and Cloisite 15A (PMMA/C30B and PMMA/C15A) was investigated using ATR-FTIR method. This technique is an experimental method that measures liquid sorption kinetics in situ. In addition to the sorption kinetics, a spectroscopic technique also gives information regarding the molecular state of the penetrant at various times in the diffusional process. Calculated diffusion coefficient of samples was 3.35×10-8
, 3.15×10-9
and 1.79×10-9
cm2
/s for PMMA, PMMA/C15A and PMMA/C30B respectively. The decrease in the diffusivity of nanocomposites is related to the fact that penetrant molecules have to circumvent the silicate nanolayers and thus 'travel' a much longer distance through nanocomposites than through a neat polymer. X-ray and DSC analysis showed that the structure of PMMA/C15A and PMMA/C30B are intercalated and exfoliated respectively. Due to the more dispersion of nanoclays in exfoliated structure and creating more tortuous path, the decrease in the diffusivity of PMMA/C30B was higher than PMMA/C15A.

Keywords: Diffusion, Poly(methyl methacrylate), FTIR-ATR, Layered silicate, Intercalated, Exfoliated.


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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 08:58 ق.ظ
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