Compatibility studies of poly(styrene‐co‐vinylphenyl hexafluorodimethyl carbinol) with bisphenol a polycarbonate, poly(butyl methacrylate), and poly(2,6‐dimethyl‐1,4‐phenylene oxide)

SYNOPSISPolystyrenes, polyacrylates, and poly ( 3,4-isoprenes) incorporating the hexafluorodimethylcarbinol functionality have been synthesized, characterized, and tested as microsensor coatings on a surface acoustic wave (SAW) device for dimethyl methylphosphonate ( DMMP ) vapor absorption sensitivity. The syntheses involved monomer functionalization and polymerization or hexafluoroacetone reaction with preformed polymer. All fluoroalcohol functionalized polymer coatings displayed sub parts per million level sensitivity with the slope of the absorption isotherm steepest a t low DMMP concentrations. The order of sensitivity for the isomeric polystyrene fluoroalcohols (meta > para %-ortho) paralleled that of the relative free hydroxyl to hydrogen-bonded hydroxyl content. Strong hydrogen bonding between the fluoroalcohol polymers and DMMP vapor was observed by IR spectroscopy. Acylation of the fluoroalcohol group markedly reduced the DMMP sensitivity.

Section: Introductionmentioning

confidence: 99%

Synthesis and evaluation of hexafluorodimethylcarbinol functionalized polymers as microsensor coatings

Snow

Sprague

Soulen

et al. 1991

“…The present work reports on the peak shift in blends due to intermolecular interactions between components of the blends. This is not due to hydrogen bonding as evidenced by the peaks, i.e., OH absorption region (3500 to 3600 cm −1 ),13 CO stretching (1737 cm −1 )14 and CH 2  symmetric stretching (2886 cm −1 ),15 which are not affected in the blend. Interactions regulate compatibility among the component polymer molecules and could be used to elucidate molecular mechanism, if any, involved in mechanical and thermal properties.…”

Section: Resultsmentioning

confidence: 84%

Studies on interfacial adhesion, tensile and thermal characteristics in blends of polystyrene/novalac resin

Konar

Ray

Konar

2006

Specific interactions generate stability of the component parts in blends. Present work aims to elucidate intermolecular interactions in polystyrene/novolac blends by means of Infrared spectroscopic studies. It was found that strong interactions were observed at band 3095 cm À1 assigned to aromatic CÀ ÀH stretching vibrations, at band 2980 cm À1 assigned to aliphatic C-H stretching vibration and at band 1635 cm À1 assigned to C¼ ¼C stretch vibration of aromatic ring system. Maximum interaction was observed in blend consisting polystyrene/novolac (80:20 by parts, in this study it is blend B). Mechanical and thermal properties of the blends were also studied. Tensile strength data was found maximum in blend B. Nonisothermal method of Freeman and Carrol was used to investigate the kinetics of thermal degradation. The reactions were studied by thermogravimetry in nitrogen atmosphere. Decomposition of the blends was found in consecutive stages. The activation energies were determined for each stage of reactions. From thermal studies, blend B was found to be most stable. A degradation mechanism was suggested by compiling the reports of previous authors.

“…26 The shape of Figure 9 suggests that competing mechanisms involving the hydroxyl moieties are involved in the interaction between SAA and PCL. Hydrogen bonds are known to form between low-molecular-weight alcohols and molecules containing carbonyl o x~g e n s ,~~~~ and similar interactions between the carbonyl moiety of PCL and the hydroxyl of SAA could reasonably be expected to be responsible for the miscible behavior observed for this system, Phenoxy/polyester blends,27J9937,38 and mixtures of poly(styrene-co-vinylphenylhexafuorodimethylcarbino1) with polyesters.…”

Section: Discussion Of Resultsmentioning

confidence: 98%

Miscible blends of poly(styrene‐co‐allyl alcohol) with poly‐ϵ‐caprolactone

Barnum

Goh

Paul

et al. 1981

SynopsisBased on the single, composition-dependent glass transition criterion, poly-6-caprolactone (PCL) was found to be miscible with each of four poly(styrene-co-ally1 alcohol) (SAA) copolymers with hydroxyl contents between 1.3 and 7.7 wt %. Melting point depression of the PCL in the blends was used to evaluate the blend interaction parameter B for each miscible system. The parameter B was found to be negative and to vary with copolymer composition in a way that suggests that an optimum density of alcohol moieties in the copolymer exists for achieving maximum interaction with PCL.