Synthesis and characterization of the hydrophobic diblock copolymers of poly(dimethylsiloxane)‐block‐poly(ethyl methyl acrylate) through atom transfer radical polymerization

Abstract

The poly(dimethylsiloxane)-block-poly(ethyl methylacrylate) diblock copolymers (PDMS-b-PEMA) were synthesized by atom transfer radical polymerization (ATRP). The chemical structure of the copolymers was characterized by nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy. Thermal behaviors were observed via differential scanning calorimetry (DSC). In the DSC curve, the resulting copolymers appear two glass transition temperatures (T-g's), one at -123 degrees C corresponding to the PDMS block and the other at 65 degrees C ascribed to the PEMA segment. Moreover, the copolymer microstructure was investigated by transmission electron microscopy (TEM). The results show that the diblock copolymers are microphase separated if the bulk contains enough PEMA segment. The surface properties of the PDMS-b-PEMA diblock copolymers were searched by contact angle. The PDMS-b-PEMA diblock copolymers are of low surface energy. The polymerization kinetics was also investigated, and the results show that the reaction proceeds in a living manner. (C) 2008 Wiley Periodicals, Inc

Polystyrene‐block‐polylactide obtained by the combination of atom transfer radical polymerization and ring‐opening polymerization with a commercial dual initiator

“…Although the living anionic polymerization of a styrenic monomer followed by the ROP of the cyclic ester monomer provides an elegant and straightforward route of synthesis,30 many efforts in the literature have been focused on the use of living/controlled free‐radical polymerization instead of anionic polymerization, combined with ROP either with sequential sequences or in a simultaneous one‐step strategy 31–39. Atom transfer radical polymerization (ATRP) is indeed known to be easier to carry out (it does not require stringent experimental conditions, e.g., high purities in the solvent and reactants) and is much more tolerant to functional groups existing on the monomer 40–44. In this article, we report a direct and robust strategy for generating PLA‐based copolymers in view of practical applications.…”

Polyrotaxane Based on Inclusion Complexes of OH-PDMS-OH and Br-PDMS-Br with γ-Cyclodextrin Without Utilizing Sonic Energy

“…Glass transition temperature (T g ) of PDMS cannot be observed in Fig. 2.6, because its value has been reported to be about −120°C [18][19][20]. The DSC thermograms for the OH-PDMS-OH/γ-CD and Br-PDMS-Br/γ-CD systems show sifting the persistence exothermic peak of PDMS (at −120°C) in all products.…”

Synthesis and Characterization of Polydimethylsiloxane end-Modified Polystyrene from Poly(Styrene – co –Vinyltriethoxysilane) Copolymers

“…For example, it has been reported that the presence of segments of PDMS in materials such as PMMA -b -PDMS -b -PMMA 1 , PEO -b -PDMS 2 , PDMS -b -PEG 3 , and PDMS -b -PEMA 4 confers them hydrophobic character. In the specific case of copolymers composed of PS and PDMS, Jiang et al, 5 studied the surface properties of PS-b-PDMS-b -PS, and found that their water contact angle ranges between 87.7 -97 °, depending on the length of the PS segments.…”