Thisin vitrostudy investigated the mechanical and structural characteristics of lignin-added PMMA resin composites at concentrations of 1, 3, and 5% by weight. Four sample groups were formed. For the transverse strength test, the specimens were prepared in accordance with ANSI/ADA specification number 12, and for the impact test ASTM D-256 standards were used. With the intent to evaluate the properties of transverse strength, the three-point bending (n=10) test instrument (Lloyd NK5, Lloyd Instruments Ltd., Fareham, Hampshire, UK) was used at 5 mm/min. A Dynatup 9250 HV (Instron, UK) device was employed for the impact strength measurements (n=10). All resin samples were tested by using a thermomechanical analyzer (Shimadzu TMA 50, Shimadzu, Japan). Mechanical tests revealed that, although the control group was found to have the value of highest transverse strength, the highest impact strength was observed in the PMMA-L-1 group. Upon examining the thermomechanical analysis data, it could be seen that theEvalue of the control sample was higher than that of all the other samples. Adding lignin powder into PMMA performs plasticizer effect on resin matrix.

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In the present paper, the effects of reactive terpolymer containing maleic anhydride on the thermomechanical properties of PVC were investigated. The thermomechanical behaviour of multicomponent blend based on poly(vinyl chloride) (PVC), PVC/maleic anhydride-stryrenemethyl metacrylate (MA-St-MMA)/n-pentyl maleat-styrene-methyl metacrylate(nPnMA-St-MMA) were studied using the TMA method. The blends were prepared by changing the weight ratio of MA-St-MMA and nPnMA-St-MMA terpolymers, and keeping the PVC content fixed at 75 wt-%. The MA-St-MMA terpolymer, a reactive copolymer, formed the compatible blends with PVC. Results indicated that the elastic properties of PVC could be controlled by the MA-St-MMA terpolymer.

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In this study, nonmiscible polyvinyl chloride (PVC) and polymethyl methacrylate (PMMA) polymers were made miscible by using MA‐St‐MMA terpolymer as a compatibilizer. Maleic anhydride‐styrene‐methyl methacrylate (MA‐St‐MMA) terpolymer was synthesized in our laboratory and used. The synthesized terpolymer was determined by FT‐IR spectroscopy. Equal mass PVC/PMMA mixture samples were prepared in series and the compatibilizer terpolymer varying between 2% and 10% by mass was added to the samples and the effect of the added terpolymer on the miscibility was determined viscometrically, thermally, mechanically and, visually. With the addition of the compatibilizer, the two components in the mixture behave like a single polymer with a single glass transition temperature (Tg) and the mixture became compatible. As a result of viscometric experiments, it has been determined that with the added MA‐St‐MMA terpolymer, the Δb value derivated from the Krigbaum‐Wall equation which is the miscibility parameter of a mixture shifted into the positive (+) zone indicating that the two polymers became miscible. By visual analysis, it was observed that the added terpolymer reduced the opaque appearance and the phase separations of the mixture. From the tensile test, a significant improvement in impact toughness was observed. When all the data obtained were evaluated, it was determined that the synthesized MA‐St‐MMA terpolymer was a suitable compatibilizer for the mixture of PVC and PMMA.