Novel materials based on silicone-acrylate copolymer networks

Abstract

This article presents a broad class of materials made by copolymerization of a family of telechelic free radically polymerizable siloxanes with various acrylate monomers that polymerize to form high Tg polymers. Films with properties ranging from strong elastomers to plastics have been obtained by UV‐initiated bulk copolymerization of functional siloxanes dissolved in acrylate monomers (in the presence of a photoinitiator). The molecular weight of the functional siloxanes, the nature of functional endgroups, the choice of (meth)acrylate comonomer, and the siloxane/acrylate ratio all have a rather dramatic effect on the morphology, and thus, on the properties of the copolymeric networks. Physical properties of the materials, such as optical appearance and mechanical and transport properties are correlated with the unique morphologies observed by TEM studies. Unusual properties such as reversible whitening of some of the materials and low Poisson ratios have been attributed to the microcavitation observed when high Tg acrylate domains interfere with the network deformation. Networks composed of high Tg acrylates (major fraction) coreacted with elastomeric siloxanes can provide heat‐shrinkable materials when they are elongated at temperatures higher than the Tg of the corresponding polyacrylates and quenched. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 159–180, 2001

Water repellency improvement of cellulosic textile fibers by betulin and a betulin-based copolymer

“…Afterwards, some waxy materials like fluorinated silanes are added to make the textile waterproof (Shi et al 2013). Unfortunately, the fluorinated silanes are expensive and contaminated wastewater is generated during the treatment process (Lee et al 2005;Mazurek et al 2001;Yahaya et al 2001).…”

The systematic study of the microstructure of crosslinked copolymers from siloxane macromonomers and methacrylates by changes in composition and components

“…Previously, different morphologies have been reported from copolymers with different ratios of constituents or different M n values using TEM observations of the acrylate/PDMS macromonomer copolymer. 9 Therefore, the aforementioned results suggest that a similar morphology in the TFEMA copolymer may appear at a lower PDMS content than that in the MMA copolymer. Furthermore, the smaller dispersion of T 1 H values of all peaks from T446 implies the finer structure or more continuous structure in T446 than that in T436 or M442.…”

“…8,9 Previous research on the amphiphilic network focused on analysis of the structure or dynamics for a specific polymer composition. Research on hydrophobic crosslinked copolymers focused on the properties of various polymerizable groups at the PDMS tail end.…”

Synthesis of waterborne hydroxyl acrylate resins and its application in VOC-free waterborne coatings

“…Reticulation is an effective strategy to improve the water resistant property of polymer latex films (Yuchin et al , 2001). Products from the organosiloxane modified epoxy resins give more mechanical strength (Tillet et al , 2011), water resistance (Ramesh and Vasudevan, 2009), high pencil hardness (Bai et al , 2017) and adhesion (Park et al , 2001) and thermal stability (Mazurek et al , 2001). A composite composed of epoxy resin, acrylic latex and organosiloxane could possess advantages of the three materials.…”