US Government As Represented by the Secretary of the Army

Jan W Andzelm

Joseph L Lenhart

Randy A Mrozek

Robert H Lambeth

Daniel B Knorr, Jr

Meimei Tidrow

Tanya L Chantawansri

Neil F Baril

Kristen S Williams

Alex Jer-Yann Hsieh

Nathan C Henry

Sumith Bandara

Toughened polymeric materials and methods of forming toughened polymeric materials are provided herein. In some embodiments, a method of forming toughened polymeric materials may include preparing a branched polymeric additive; mixing the branched polymeric additive with a polymer to form a polymeric mixture, wherein the branched polymeric molecule either mixes and/or bonds with the polymer to reduce mobility in the polymer; and curing the polymeric mixture. In some embodiments, a toughened polymeric material comprises a polymer network; and a branched polymeric molecule bonded to the polymer network.

Branched additives for polymer toughening

A method for producing a surfaced passivated, encapsulated surface III-V type II superlattice (T2SL) photodetector, more specifically a p-type heterojunction device by cleaning, etching and exposing the surface of a III/V material to solution mixtures which simultaneously removes oxides from the surface and encapsulates the surfaces.

Method of passivating and encapsulating III-V surfaces

The disclosure relates to matrix composites comprising high strain-rate sensitive elastomers in a multi-layer construct which provide ballistic-resistant material systems with enhanced protection against blast damage as well as ballistic impact. According to one embodiment, a matrix composite for impact resistance and blast mitigation formed in a multi-layer configuration may include: (a) one or more outer layers comprising poly(urethane urea) having a strain-rate sensitivity characteristic in the range of 1,000/sec to 1,000,000/sec; and (b) one or more inner layers comprising poly(urethane urea) having a strain-rate sensitivity characteristic in the range of 10,000/sec to 1,000,000/sec.

Multi-layer matrix composite having improved energy absorption, dissipation and shock wave mitigation capabilities

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North East, MD, United States of America

Jan W Andzelm