Responsive polymer brushes diblock-copolymers

The effect of silicone oil and carboxylated silicone on intraocular lenses was studied with FTIR spectroscopy. It was noticed that washing with n-pentane removed the adhered silicone oils from two types of lenses, while residual oil was detected in other cases [22], The development of sequential interpenetrating polymer network (IPN) based on poly(2-methacryloyloxyethylphosphorylcholine) and silicone was studied with FTIR spectroscopy. It was discovered that IPN possesses reduced protein absorption tendency compared to pristine silicones and can be used as a novel ophthalmic biomaterial [23]. The stimuli responsive ultra-thin diblock copolymer brushes were developed on the surface of silicone rubber and studied with FTIR spectroscopy. The authors studied the thermally-induced evolution mechanism of various interactions using... 

Abstract This article reviews results from our group of the synthesis and characterization of diblock copolymer brushes. Results from the literature are also covered. We report a wide variety of diblock compositions and compare the miscibility of the two blocks with the tendency to rearrange in response to block-selective solvents. Also, we describe the types of polymerization methods that can be utilized to prepare diblock copolymer brushes. We have compared the molecular weight of free polymer and the polymer brush based on results from our laboratory and other research groups we have concluded that the molecular weight of the free polymer and that of degrafted polymer brushes is similar. 

Another interesting design of mixed polymer brushes was obtained by sequential grafting of asymmetric nonsticky/sticky diblock copolymers of poly(styrene-b-3-(trimethoxysilyl)propylmethacrylate) and monomethoxypoly(ethylene glycol)-trimethoxysilane onto silicon wafers (Han et al., 2013). The nanoscopic morphology of these mixed polymer brushes exhibited stimuli responsive behavior to various temperatures and solvents. 

Han, M., Ryu, J.-S., Park, J.-W. (2013). Homo- and mixed polymer brushes prepared by surface-grafting of asymmetric non-sticky/sticky diblock copolymers and their stimuli-responsive behaviors. Reactive and Functional Polymers, 73, 66-72. 

Combination of two stimuli-responsive polymers with low polydispersity as grafted diblock copolymer brushes in cylindrical pores leading to four different effective pore diameters as a function of the combination of the two stimuli (temperature change, AT, around the lower critical solution temperature of the first polymer block/here PNlPAAm pH change, ApH, around the pKa of the second polymer block/here PAA) (From Friebe, A., and Ulbricht, M., Macromolecules, 42,1838-1848,2009.)... 

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