کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5181219 | 1380954 | 2014 | 11 صفحه PDF | دانلود رایگان |
- Developed multi-layer films showed enhanced gas-barrier properties and flexibility.
- Organoclay content increased out-of-plane birefringence values.
- Shear viscosity & stress increased with organoclay loading at low shear rates.
- Crossover behavior was observed in rheological behavior as the clay concentration increased at critical shear rate of 0.35Â sâ1.
- Permeability values decreased over 50% in comparison with the neat PAI films.
Multifunctional single and triple-layer films exhibiting flexibility, enhanced modulus and gas barrier properties were developed using a soluble polyamide-imide (PAI) in dimethylacetamide (DMAc) with ammonium-modified montmorillonite (MMT, Cloisite 30B) mineral clay. The drying behavior and associated anisotropy development were determined real-time, using a newly developed real-time measurement system. Out-of-plane birefringence development takes place earlier for thinner neat samples caused primarily by increased depletion rate of solvent. Addition of organoclay content resulted in a decrease in evaporation rate of solvent due to planar orientation of well exfoliated nanoplatelets as shown by TEM images and WAXS. This is in agreement with the out-of-plane anisotropy development observed during drying. Beyond a critical solid wt%, out-of-plane birefringence started to increase earlier with organoclay addition. In the case of multi-layer organoclay reinforced PAI films, the drying behavior of each individual layer was tracked and a complementary drying model is proposed. Planar orientation of nanoplatelets resulted in high helium-barrier properties.
334
Journal: Polymer - Volume 55, Issue 16, 5 August 2014, Pages 4091-4101