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Lower moisture absorption and better mechanical properties were found in the nanophased composites even after moisture conditioning.
Moreover, these polymers maintained good mechanical properties (G′ ∼ 108 Pa) up to 280°C and had lower moisture absorption than common polyamides.
Compared with the analogous control aromatic polyimide NPI-x, FPI-x shows better solubility, improved optical transparency, lower moisture absorption and surface energy, owing to the presence of the fluorine-containing group and alicyclic structure in the polymer chain.
Perfluorononenyloxy group-containing polyimides (VII3a d) had lower dielectric constant (ranged from 2.73 to 2.56), lower moisture absorption, and better solubility than those of analogous polyimides (VII1a d, VII2a d) which do not contain perfluorononenyloxy group.
The cured DGEBF/fluorenyl diamine systems exhibit remarkably higher glass transition temperature, better thermal stability and lower moisture absorption compared to those of DGEBA/fluorenyl diamine systems, and display approximate heat resistance and much better moisture resistance relative to those of TDE-85/fluorenyl diamine systems.
This caused the lower moisture absorption by the EA -and HEMA-grafted fibers.
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Incorporation of about 30 wt% laurolactam resulted in a copolymer that had a crystalline melting point that was only slightly lower than that of nylon 6, but had considerably lowered moisture absorption.
Water is unable to penetrate between molecules in the crystalline region of a fibre as well as it penetrates the amorphous regions; therefore, increased alignment tends to lower the moisture absorption of the fibre.
Samples made using an equimolar ratio of anhydride-to-epoxy groups had lower conversion of functional groups as shown by the somewhat lower gel fraction and higher moisture absorption.
The cured DCPDBMI/DCPDCY exhibits lower dielectric constant, dissipation factor and moisture absorption than those of DDMBMI/BADCY.
Results showed that the nano-composite had a much higher loss factor, lower glass transition temperature and higher moisture absorption than other samples.
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