Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 227 for “"Polyimide"”.
-
Electrical conduction in polyimide
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1989.
-
Characterization of modified polyimide adhesives
… Linear, high molecular weight, thermoplastic polyimides and poly(imide-siloxane) homo- and copolymers prepared by bulk and solution thermal imidization were investigated as structural adhesives for titanium. The solution thermal imidization procedure was found to result in favorable adhesive …
-
Measuring and Improving Copper-Polyimide Adhesion
… strength between nano-sized copper clusters and polyimide. The copper clusters are formed under UHV conditions by using mono-layer per minute deposition rates to assist equilibrium cluster formation. Values of the strength of adhesion from these contact angle measurements are in reasonable …
-
Laser Processing of Polyimide on Copper
… effective and flexible method for processing polyimide over other wet and dry processes. This thesis represents the results of research on the laser processing of polyimide on copper. The research examines the effect of the laser processing parameters using a CO2 laser. The parameters examined …
-
Metal/polymer interactions in polyimide adhesives
… their superior thermal and chemical stability, polyimides are often used as adhesives in hazardous environments. This study examines the effect of thioether sulfur in the polyimide backbone on bond strength. X-ray photoelecton spectroscopy (XPS) and reflectance infrared spectroscopy indicated …
-
Gas permeability of polyimide/polysiloxane block copolymers
A series of perfectly alternating polyimide/ poly(dimethylsiloxane) microphase separated block copolymers ranging from 0-50 wgt. % poly(dimethylsiloxane) have been measured for permeability characteristics. The polyimide segment of the copolymers was based on oxydiphthalicdianhydride (ODPA) and …
-
Development of polyimide/metal gradient microcomposite films
Polyimides are attractive polymers because of valued intrinsic properties such as high thermal stability and good solvent resistance. At the same time, much effort is put into modifying polyimides to introduce different properties. This thesis describes a study where polyimides were modified with …
-
Effect of a derivatized oxide layer and environment on the bond durability of aluminum/polyimide and titanium/polyimide bonds
A surface pretreatment for aluminum and titanium involving the reaction of phosphonic acid (RPO(OH)2), R=butyl or vinyl for aluminum and R=vinyl for titanium, has been investigated. The durability of phosphonic acid-pretreated samples was compared with that for P2-etched (ferric sulfate-sulfuric …
-
Processing Ion Beam Mixed Nickel/Polyimide Thin Films
… established a method of fabrication for Nickel/Polyimide ion beam-mixed films using thermal evaporation. We then used the low-temperature characterization system in the Materials Physics Testing lab at SMSU to measure the resistance of each film as a function of temperature. These methods have …
-
Study of a microcomposite metal-doped polyimide adhesive
… bond. This thesis describes a study in which a polyimide was modified by the addition of metal compounds in an effort to develop a graded interface between the adhesive and aluminum adherends. The results of mechanical adhesion testing and instrumental analysis of the failed surfaces indicated …
-
Modification of polyimide films via tin complex incorporation
The modification of polyimide films by tin-complex incorporation has been studied with the aim of producing materials with the mechanical and thermal properties of polyimide with enhanced electrical properties. A variety of Sn(II) and Sn(IV) complexes have been incorporated into BTDA/ODA (3,3 14,4 …
-
A study of polyimide films modified with gold
… laboratories have produced a wide variety of polyimide films which have been modified by the incorporation of metal compounds. These polymer/metal composites have potential use as coatings in aerospace applications where enhanced electrical conductivity and thermal stability are desirable. …
-
Synthesis of poly(arylene ether sulfone)-polyimide segmented copolymers
… of post reactions. Poly(arylene ether sulfone)-Polyimide segmented copolymers were synthesized using a solution imidization procedure with NMP as the solvent and o-dichlorobenzene as the azeotroping agent. The polysulfone oligomers were reacted into the system via the diamine oligomer. The …
-
Structure-property behavior of polyimide homopolymers, copolymers, and blends
Fully imidized, high molecular weight polyimide homopolymers and random segmented poly(siloxane imide) and poly(aryl ether imide) copolymers were prepared for use as environmentally stable, tough structural matrix resins, structural adhesives, and dielectric materials. Although polyimides are well …
-
Durability of Polyimide/Titanium Adhesive Bonds: An Interphase Investigation
… study, this was found to be the case with a polyimide adhesive bonded to chromic acid anodized (CAA) Ti-6Al-4V. The objective of the current research has been twofold: 1) to investigate the effect of thermal aging on the interphase region of polyimide/titanium adhesive joints, and 2) to …
-
Integration of Power Electronics Building Block Using Polyimide Substrates
… behind this concept is a new generation of polyimide substrate and its unique electro-thermal-mechanical behavior. Polyimide substrates offer significantly greater design flexibility than traditional ceramic-based designs. They support thicker copper layers and thinner dielectric layers, …
Page 1 of 12