Accession Number : ADD017866

Title :   Photocrosslinkable Polyphosphazenes and Their Use as Microencapsulation Materials.

Descriptive Note : Patent, filed 15 Apr 94, patented 7 Nov 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Allcock, Harry R ; Cameron, Charles G ; Smith, Dawn E

Report Date : 07 Nov 1995

Pagination or Media Count : 24

Abstract : Chalcone and cinnamate bearing polyphosphazenes are disclosed. The polyphosphazenes contain a sufficient number of chalcone or cinnamate groups, or a combination thereof, to achieve a photocrosslinkable material. The phosphazene backbone is transparent from the near and mid-UV to the near infrared region, minimizing degradation of the skeleton both under the high intensity UV irradiation required for the photo-crosslinking reaction and during subsequent exposure to light disclosed. These photosensitive polyphosphazenes are useful for a variety of purposes, including in photolithography, photocurable coatings, for the stabilization of certain non-linear optical properties, and for use in the construction of biocompatible semi-permeable membranes which can be used to encapsulate living cells or other substances of implantation.

Descriptors :   *PHOTOCHEMICAL REACTIONS, *MATERIALS, *POLYMERS, *CROSSLINKING(CHEMISTRY), *ENCAPSULATION, *PATENTS, *PHOSPHAZENE, OPTICAL PROPERTIES, ULTRAVIOLET RADIATION, DEGRADATION, EXPOSURE(GENERAL), LIGHT, REGIONS, NONLINEAR SYSTEMS, HIGH INTENSITY, IRRADIATION, INFRARED RADIATION, CELLS(BIOLOGY), NEAR INFRARED RADIATION, IMPLANTATION, PHOTOLITHOGRAPHY, SKELETON, PHOTOSENSITIVITY

Subject Categories : Polymer Chemistry
      Radiation and Nuclear Chemistry
      Miscellaneous Materials
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE