Abstract
AbstractIt is found that forced (reactive) blending of polystyrene (PS) with polymethylmethacrylate (PMMA) involves the covalent binding of heterogeneous macromolecules to afford the paired polymers. For this purpose, the “anchor” N-H unsubstituted tetrazole or oxirane functional groups are preliminarily introduced in the structure of both polymers in a small amount that leads to a covalent binding of the heterogeneous macromolecules. The reaction between the modified PS and PMMA is carried out in dimethylformamide (DMF), toluene and dichloroethane (DCE) at a high total concentration of polymers (10-20 g dL-1). The process is accompanied by gel-formation to deliver cross-linked paired polymers It is established that the highest rate of the paired polymer is attained in the DCE medium, while the lowest rate is observed in DMF. For paired polymers synthesized in DMF, two glass transition temperatures (Tg) of 92°C and 104°C correspond to the original PS and PMMA, respectively. The products of forced blending of PS and PMMA in toluene have one averaged Tg value (99°C), whereas those obtained in DCE show no pronounced glass transition region at 90 ÷ 115°C. In toluene or DCE, the paired polymers are formed, which represent single-phase systems having one glass transition region.
Highlights
PboilnydminegthyolfmheetthearcoKrgyeelynawteeoou(rPsdMsm:MaLAce)-onacmrodamcprpoaomiurno, ldtersciduiliaessgobnabaseellodmngaoitnnrigx,thstoeelf-cddoiuvffaaellreenntt, bonding of sometimes romolecules to afford the paired polymClearsss. iFocrattihoins: 17cBo3m7,p1le5tAel2y1 incompatible, polymers [1,2,3]
Kizhnyaev et al.: Conetworks on the base of polystyrene with poly(methyl methacrylate) paired polymers overlapping of macromolecular coils and their chemical interaction occur in a very restricted space, occupied by a coil
We report a method for the forced blending of PS with PMMA via the formation of the paired polymers
Summary
Commercial monomers styrene and MMA (Merck) as well as VO (bp 57°C / 1 mm Hg) and VT (mp 126°C) (manufactured in Russia) were used. V.N. Kizhnyaev et al.: Conetworks on the base of polystyrene with poly(methyl methacrylate) paired polymers 423 using an ampoule method in argon atmosphere under the action of AIBN (0.5 mass% of the weight of monomers) in DMF at 60°C for 48 h. The resulting polymers were precipitated and washed from unreacted monomer residues in the Soxhlet apparatus with diethyl ether (in the case of modified PMMA) or ethanol (in the case of styrene-containing samples), dried under vacuum to constant weight. The composition of oxirane-containing polymers was established by chemical analysis of the epoxy groups as well as by 1H NMR spectroscopy (for modified PMMA).
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