Shape memory polymer articles with a microstructured surface

Abstract

A shape memory polymer article is disclosed. The article may include a surface having a microstructure and it may include a shape memory polymer. The shape memory polymer may include a copolymer network. The copolymer network may be formed from the reaction product of a free radically polymerizable siloxane having greater than one functional free radically polymerizable group and at least one (meth)acrylate monomer.

1 . An article, comprising:
 a polymeric member including a surface having a microstructure; and   wherein the polymeric member comprises a shape memory polymer, the shape memory polymer comprising a copolymer network comprising the reaction product of a free radically polymerizable siloxane having greater than one functional free radically polymerizable group and at least one (meth)acrylate monomer, wherein the at least one (meth)acrylate monomer, when homopolymerized, forms a homopolymer having a glass transition temperature, a melting temperature, or both greater than about 40° C.   
   
   
       2 . The article of  claim 1 , wherein the free radically polymerizable siloxane has a number average molecular weight of about 1,000-200,000 grams per mole. 
   
   
       3 . The article of  claim 1 , wherein the free radically polymerizable siloxane includes a telechelic siloxane. 
   
   
       4 . The article of  claim 2 , wherein the telechelic siloxane includes (meth)acryloxyurea siloxane. 
   
   
       5 . The article of  claim 2 , wherein the telechelic siloxane includes acrylamidoamido siloxane. 
   
   
       6 . The article of  claim 2 , wherein the telechelic siloxane includes methacrylamidoamido siloxane. 
   
   
       7 . The article of  claim 2 , wherein the telechelic siloxane includes methylstyrylurea siloxane. 
   
   
       8 . The article of  claim 1 , wherein the (meth)acrylate monomer includes isobornyl acrylate. 
   
   
       9 . The article of  claim 1 , wherein the copolymer network includes about 10-70 weight-percent of the free radically polymerizable siloxane. 
   
   
       10 . The article of  claim 1 , wherein the copolymer network includes about 10-60 weight-percent of the free radically polymerizable siloxane. 
   
   
       11 . The article of  claim 1 , wherein the copolymer network includes about 20-60 weight-percent of the free radically polymerizable siloxane. 
   
   
       12 . The article of  claim 1 , wherein the polymeric member includes a secondary surface having a microstructure. 
   
   
       13 . An article, comprising:
 a polymeric member including a microstructured surface, wherein the microstructured surface includes a surface feature that is not visible to an unaided eye; and   wherein the polymeric member includes a shape memory polymer.   
   
   
       14 . The article of  claim 13 , wherein the shape memory polymer comprises a copolymer network comprising the reaction product of a free radically polymerizable siloxane having greater than one functional free radically polymerizable group and at least one (meth)acrylate monomer, wherein the at least one (meth)acrylate monomer, when homopolymerized, forms a homopolymer having a glass transition temperature, a melting temperature, or both greater than about 40° C. 
   
   
       15 . The article of  claim 14 , wherein the free radically polymerizable siloxane has a number average molecular weight of about 1,000-200,000 grams per mole. 
   
   
       16 . The article of  claim 14 , wherein the (meth)acrylate monomer includes isobornyl acrylate. 
   
   
       17 . The article of  claim 14 , wherein the free radically polymerizable siloxane includes a telechelic siloxane. 
   
   
       18 . The article of  claim 17 , wherein the telechelic siloxane includes (meth)acryloxyurea siloxane, acrylamidoamido siloxane, methacrylamidoamido siloxane, or methylstyrylurea siloxane. 
   
   
       19 . The article of  claim 13 , wherein the surface feature includes a plurality of depressions. 
   
   
       20 . The article of  claim 13 , wherein the surface feature includes a plurality of projections. 
   
   
       21 . The article of  claim 13 , wherein the polymeric member includes a secondary surface having a microstructure. 
   
   
       22 . An article, comprising:
 a polymeric member including a microstructured surface, wherein the microstructured surface includes a surface feature that is not visible to an unaided eye; and   wherein the polymeric member includes a shape memory polymer, the shape memory polymer comprising a copolymer network comprising the reaction product of (meth)acryloxyurea siloxane and isobornyl acrylate.   
   
   
       23 . An article comprising a shape memory polymer having a microstructured surface and comprising a copolymer network, the copolymer network comprising the reaction product of a free radically polymerizable siloxane having greater than one functional free radically polymerizable group and at least one (meth)acrylate monomer, wherein the at least one (meth)acrylate monomer, when homopolymerized, forms a homopolymer having a glass transition temperature greater than about 40° C.