Styrene-methylmethacrylate copolymers

H Jagt, Y Dirix, R Hikmet, and C Bastiaansen, Linear polarizers based on polymer blends oriented blends of poly(ethylene-2,6-naphthalenedicarboxylate) and a poly(styrene/methylmethacrylate) copolymer, Jpn. J. Appl. Phys., 37 4389-4392, 1998. 

Several reports have appeared in which the UV absorption spectrum of PS was found to be qualitatively similar to an alkyl benzene model compound. Vala and Rice15> demonstrated the similarity between atactic PS and ethyl benzene this was confirmed for atactic PS in cyclohexane by Hirayama 16) and in tetrahydrofuran by Abuin 17>. Bovey and co-workers20) found that absorbance spectra for isotactic PS, atactic PS, and styrene-methylmethacrylate copolymers in 1,2-dichloroethane were roughly similar to that of toluene. 

Since the data for the styrene-methylmethacrylate copolymer show that Tcr and ycr occur (Figure 1) very close to the Newtonian range, this empirical procedure should give reliable values of zero shear viscosity. 

We may find confirmation for our statement about the thermodynamic incompatibility of linear polystyrene with the styrene-DVB copolymer in experiments by Wong et al. [269]. These authors reported similarities in the phase separation power of linear polystyrene and that of linear styrene-methylmethacrylate copolymer, the latter being a priori incompatible with the styrene-DVB network. Complete incompatibility of polystyrene with linear polydimethylsiloxane facihtates phase separation and results in the formation of a porous styrene-DVB network on adding as little as 0.5-1% of the above porogen to the initial comonomer mixture (Fig. 3.2, curves 4). It is also not surprising that the porosity of copolymers induced by linear polystyrene and linear polydimethylsiloxane is almost the same when the DVB content exceeds 10%. At a DVB content that hi, the network formed differs fundamentally from linear polystyrene, as from any alien polymer. 

S tyrene- acrylonitrile Styrene-butadiene elastomers Styrene-methylmethacrylate copolymer Sulfo-ethylene-propylene-diene monomer ionomers Syndiotactic polystyrene... 

Ki-aton G1600 SEES Perfluorinated ionomers Phenolic resins Polystyrene, head-to-head Poly(yinyl chloride), head-to-head S tyrene- acrylonitrile Styrene-butadiene elastomers Styrene-methylmethacrylate copolymer Sulfo-ethylene-propylene-diene monomer ionomers Vinylidene fluoride-hexafluoropropylene elastomers Chemigum... 

SMI Copolymer from styrene and maleimide SMM Styrene-methylmethacrylate copolymer SMMA Styrene methylmethacrylate sPhPS Syndiotactic poly(p-phenyl styrene) sPP Syndiotactic polypropylene sPS Syndiotactic polystyrene SSE Single-screw extruder TM Thio-rubber... 

Figure 4.12 shows a typical program of a 39.61 wt% styrene - methylmethacrylate copolymer. The identification of all dimer and trimer peaks was accomplished by... 

Palladium complexes of 2-pyridyldiphenylphosphane anchored on polystyrene, polymethylmethacrylate, and styrene-methylmethacrylate copolymer were found to form highly active heterogeneous catalysts for the alkoxycarbonylation of terminal alkynes with activities approaching those obtained under homogeneous conditions... 

Rana et al [36] have used DMA to carry out investigations into the viscoelastic behaviour, plastic deformation behaviour, molecular orientation, and the orientation relaxation behaviour of an alternating styrene-methylmethacrylate copolymer. The experiments were carried out at a number of isothermal temperatures, covering the glassy state, the 7 region and the rubbery plateau with a range of frequencies used for each temperature. The data obtained were compared to those produced by a random copolymer of styrene and methylmethacrylate, and were interpreted in relation to the role of polar-polar intermolecular interactions between the methylmethacrylate units in the two polymers. 

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