University of Delaware

Jerold M Schultz

Stoyko C Fakirov

Nadka V Avramova

I-Hwa Lee

Robert W Birkmire

Michail G Evstatiev

Habib Hichri

Isak A Avramov

Matheswaran Marudachalam

Methods are provided for the production of supported monophasic group I-III-VI semiconductor films. In the subject methods, a substrate is coated with group I and III elements and then contacted with a reactive group VI element containing atmosphere under conditions sufficient to produce a substrate coated with a composite of at least two different group I-III-IV alloys. The resultant composite coated substrate is then annealed in an inert atmosphere under conditions sufficient to convert the composite coating to a monophasic group I-III-VI semiconductor film. The resultant supported semiconductor films find use in photovoltaic applications, particularly as absorber layers in solar cells.

Process for preparing group Ib-IIIa-VIa semiconducting films

Polyamide bodies, e.g., foils or sheets, are welding together or laminated by forming methylene bridges between nitrogen atoms in the separate bodies by pressing them together in the presence of a alkaline paraformaldehyde/methanol solution containing a catalytic amount of oxalic acid.

Welded or laminated polyamides

A process of preparing a homogeneous amorphous polymeric blend of polyethyleneterephthalate (PET) and polybutyleneterephthalate (PBT) which includes intimately mixing the PET and PBT at a weight ratio of about 10:90-90:10, melting the mixture at 290.degree.-330.degree. C., cooling the mixture to 0.degree.--194.degree. C. by extruding it onto rollers maintained in a cooling bath and orienting the polymer of the resulting continuous shaped object at room temperature to a draw ratio of about 5:1, with subsequent annealing at about 120.degree.-180.degree. C. for about one hour.

Process of making a blend of PET and PBT

Method for welding and laminating polyamides

Described and claimed is a process for obtaining high-modulus, high-strength linear polycondensates, e.g., polyamides, comprising the sequential steps drawing at room temperature, isothermal annealing at 180.degree.-270.degree. C., a second drawing at room temperature, and a second isothermal annealing at 120.degree.-260.degree. C., an orientation degree after the second drawing being 20-25.

Preparation of high-modulus, high-strength linear polycondensates

The present invention relates to chemical bonded laminates generally, with condensation polymer laminae species.

Chemically bonded structures of polymeric members

The invention relates to chemically bonded laminated structures and their production from oriented polymeric laminae. The bonds between the contacting lamina are formed by chemical reaction across their interface involving constituent molecular chains of each laminae. Three methods have been found for producing the bonds: (a) bringing the surfaces of the lamina in intimate contact to within 10.degree. C. and 100.degree. C. below the melting temperature of the surfaces; (b) interposing a coupling agent for the polymer molecules of the intimately contacting surfaces of each member into their interface and heating the laminate to a temperature effective to cause reaction of the coupling agent with the molecules of each; and (c) interposing a catalyst to promote chemical reaction of the molecules of each laminae with the molecules of intimately contacting lamina into their interface and heating to a temperature effective to cause reaction. Structures bonded may be from film sheets, strips or bands or they may be other configurations that have suitable surfaces for that intimate contact required.

Interfacial bonding of polymeric laminae in the solid state

The present invention relates to laminates of polyolefin laminae and strips chemically bonded in the solid state by reactions initiated by cross-linking catalysts interspersed at the interface of contacting laminae. Catalysts to initiate crosslinking reactions at temperatures below the melting point of the respective laminae are employed. A preferred application of the laminate is a chemically bonded structure of highly oriented, preferably uniaxially oriented film with the direction of orientation of uniaxial orientation at an angle to each other in successive laminae.

Chemically bonded polyolefin laminates

Fibers and plastic materials reinforced with these fibers which have a diameter that varies along the fiber axis are provided. The fibers increase the strength of the material by reducing fiber pull out from the plastic matrix. The variation in diameter results in an undulating surface on the fiber which locks it into the matrix.

Growing community of inventors

Newark, DE, United States of America

Jerold M Schultz