Nanoporous low-? polyimide films prepared from poly(amic acid)s with grafted poly(methylmethacrylate)/poly(acrylamide) side chains

2003 ◽  
Vol 13 (9) ◽  
pp. 2150 ◽  
Author(s):  
G. D. Fu ◽  
W. C. Wang ◽  
S. Li ◽  
E. T. Kang ◽  
K. G. Neoh ◽  
...  
Keyword(s):  
Amic Acid ◽  
Side Chains ◽  
Polyimide Films ◽  
Poly Acrylamide

Synthesis of Surface-Metallized Polyimide Films via in Situ Reduction of (Perfluoroalkanoato)silver(I) Complexes in a Poly(amic acid) Precursor

1998 ◽  
Vol 10 (5) ◽  
pp. 1408-1421 ◽  
Author(s):  
Robin E. Southward ◽  
Christopher M. Boggs ◽  
David W. Thompson ◽  
Anne K. St. Clair
Keyword(s):  
Amic Acid ◽  
In Situ Reduction ◽  
Polyimide Films ◽  
Acid Precursor

Surface Modification-Based Fabrication of Double Surface Highly Reflective and Conductive Metallized Polymeric Films and Microstructural Tuning Nanocomposite Layers

2006 ◽  
Vol 11-12 ◽  
pp. 497-500
Author(s):  
Zhan Peng Wu ◽  
De Zhen Wu ◽  
Fang Li ◽  
Feng Hong Hong ◽  
Sheng Li Qi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Film Surface ◽  
Silver Ions ◽  
Polyimide Film ◽  
Amic Acid ◽  
Silver Clusters ◽  
Polyimide Films ◽  
Near Surface ◽  
Double Surface ◽  
Conductive Surfaces

Silvered polyimide films have been prepared by alkali hydroxylation of polyimide film surface and incorporation of silver ions through subsequent ion exchange. Thermal curing had not only re-cycloimidized the poly(amic acid) into polyimide, but also reduced silver ions into silver atoms and near-atomic silver clusters, which diffused and aggregated to give reflective and conductive surfaces without addition of reducing agents. By this method, silvered polyimide films can be easily fabricated with double excellent reflective (reflectivity > 97%) and conductive surfaces (surface resistance: 0.02 /sq), outstanding metal-polymer adhesion, high mechanical properties, and controllable thickness of silver layers at modest cost. As the side-to-side near-surface microstructure difference in the laboratory made samples and commercial PI films, the thickness of alkali induced hydrolysis, loading of silver ions and forming of silver layers at the two sides of the polyimide films were also discussed here. Films were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and tapping mode atomic force microscopy (AFM). Results show that continuous silver layers were formed on the polyimide films.

Amphiphilic Poly(acrylamide)s Having Saturated and Unsaturated Dialkyl Chains and Phosphatidylcholine Groups in the Side Chains

1996 ◽  
Vol 29 (18) ◽  
pp. 5810-5817 ◽  
Author(s):  
Y. F. Wang ◽  
T. M. Chen ◽  
Y. J. Li ◽  
M. Kitamura ◽  
T. Nakaya ◽  
...  
Keyword(s):  
Side Chains ◽  
Poly Acrylamide

Synthesis and properties of novel polyimides containing 2,6-benzobisoxazole units

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Xiangli Meng ◽  
Yudong Huang ◽  
Zushun Lv ◽  
Hong Yu
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Amic Acid ◽  
Aprotic Solvents ◽  
Polyimide Films ◽  
Excellent Thermal Stability ◽  
Glass Transition Temperatures ◽  
Aromatic Polyimides ◽  
H Nmr ◽  
Structures And Properties

AbstractThe diamine monomer, 2,6-bis(p-aminophenyl)-benzo-[1,2-d; 5,4-d’] bisoxazole was successfully synthesized. Three aromatic polyimides (PI) based on 2,6-bis(p-aminophenyl)-benzo-[1,2-d; 5,4-d’] bisoxazole were prepared via a conventional two-stage procedure with a variety of dianhydrides. Their structures and properties were characterized by FTIR, 1H NMR, TG, DSC and XRD. The intermediate poly(amic-acid)s (PAA) had inherent viscosities of 1.18-1.70 dL/g and could be thermally converted into lightly yellow polyimide films. The resulted polyimides showed excellent thermal stability, and the glass transition temperatures (Tg) of all polymers were above 280 oC, and the 5% weight loss temperatures of polymers were about 550 oC in N2. The solubility of these polyimides in various solvents was evaluated. They were all insoluble in conventional polar aprotic solvents.

scholarly journals Enhancement of the Mechanical Properties of Polyimide Film by Microwave Irradiation

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 477 ◽  
Author(s):  
Ju-Young Choi ◽  
Seung-Won Jin ◽  
Dong-Min Kim ◽  
In-Ho Song ◽  
Kyeong-Nam Nam ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Irradiation Time ◽  
Polyimide Film ◽  
Amic Acid ◽  
Polyimide Films ◽  
Inorganic Substance ◽  
Short Irradiation Time ◽  
Green Approach ◽  
Thermal Imidization ◽  
Mw Irradiation

Polyimide films have conventionally been prepared by thermal imidization of poly(amic acid)s (PAAs). Here we report that the improvement of tensile strength while increasing (or maintaining) film flexibility of polyimide films was accomplished by simple microwave (MW) irradiation of the PAAs. This improvement in mechanical properties can be attributed to the increase in molecular weight of the polyimides by MW irradiation. Our results show that the mechanical properties of polyimide films can be improved by MW irradiation, which is a green approach that requires relatively low MW power, very short irradiation time, and no incorporation of any additional inorganic substance.

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