Fluorine‐containing polymers. IV. Polymers of acrylates of fluorine‐containing ether alcohols

Abstract

A number of polymers of acrylates of fluorine‐containing ether alcohols were prepared and studied. The side‐chain structures investigated are: CF3CH2OCH2CH2OCO, CF2HCF2OCH2CH2OCO, CF2HCF2(OCH2CH2)2OCO, CF3CF2CF2CH2OCH2CH2OCO, and RfOCF2CF2CH2OCO, where Rf equals CF3, CF3CF2, CF3CF2CF2, and CF3CF2CF2CF2. Of these, the last group has glass transition and stiffening temperatures 20–25°C. lower than those of most of the others, together with the small swelling in solvents characteristic of the RfCH2OCO series. It is concluded that polymer behavior, particularly the modulus‐temperature and solubility characteristics, may be very profoundly affected by the nature of the side chains. An interpretation of the behavior of the polyacrylates of the fluorinated ether‐alcohols in terms of increased side‐chain flexibility due to ether “swivel joints” is attractive, but may not be justified.

Two-Step Recrystallization of Water in Concentrated Aqueous Solution of Poly(ethylene glycol)

“…Suppression of the diffusion of water molecules in polymer matrices has been reported in several cases: polystyrene (PS, 180 K), 35,58 poly(methyl methacrylate) (PMMA, 200 K), 59 poly(n-butyl methacrylate) (PBMA, 210 K), 36 PMEA (210 K), 55 and poly(ethoxyethyl acrylate) (PEEA, 220 K) 36 . The T g 's of the five polymers were 373 K, 60 412 K, 61 288 K, 60 223 K 26 and 223 K, 62 respectively. The relation between T g and suppression T of the diffusion clearly indicates that the suppression of diffusion depends on the strength of the electrostatic interaction site rather than T g .…”

Recrystallization of Water in Non-Water-Soluble (Meth)Acrylate Polymers Is Not Rare and Is Not Devitrification

“… a This work. b Reference . c Reference . d Reference . e Reference . f Reference . g Reference . h Reference . i Reference . j Reference . k Reference . l Reference . m The values were not obtained in the literature. Therefore, the values are assumed to be the same as that of pEEMA. …”

Photonic Bandgap Composites

“…As indicated in the DMTA response of the PBG composite, only one relaxation is observed between ±150 C and 125 C. In addition, Figure 4 presents the heating thermograms of various components of the PBG composite which have been photopolymerized into lightly crosslinked homopolymers. The PBG composites are composed of a majority of polymerized MOEA (e.g., ³80 vol.-%), therefore, the transition temperature of the composite most resembles the ªpureº PMOEA, where the glass transition (T g ) of an uncrosslinked PMOEA has been previously reported in the range of ±50 C to ±33 C. [22,23] The influence of the poly(ethylene glycol) methacrylate (PEGMA) and polystyrene in the composite is not apparent in either the DMTA or DSC analysis. The T g of the PBG composite can be altered by copolymerization of additional acrylate monomers with MOEA, or through a complete substitution.…”