Polymethyl methacrylate nanocomposite

Hu et al. [159] studied the viscoelastic properties of silica-polymethyl methacrylate nanocomposites. These nanocomposites exhibited higher storage and loss modulus than those of pristine polymethyl methaaylate. 

Hu et al. [122] found that in silica-polymethyl methacrylate nanocomposites, the Tg increased with increasing silica content. Also, other thermal properties were enhanced by incorporating silica into the polymer matrix for example, polymer degradation temperature was about 30°C higher than for virgin polymethyl methacrylate. 

The data provided by Toyota Research Group of Japan on polyamide-MMT nanocomposites indicate tensile strength improvements of approximately 40%-50% at 23°C and modulus improvement of about 70% at the same temperature. Heat distortion temperature has been shown to increase from 65°C for the unmodified polyamide to 152°C for the nanoclay-modified material, all the above having been achieved with just a 5% loading of MMT clay. Similar mechanical property improvements were presented for polymethyl methacrylate-clay hybrids [27]. 

To modify polycarbonates and derivatives of polymethyl methacrylate dichloroethane and dichloromethane media are used. To modify pol5winyl chloride compositions and compositions based on phenolformaldehyde and phenolrubber polymers alcohol or acetone-based media are applied. The FS of metal/carbon nanocomposites are produced using the above media for specific compositions. In IR spectra of all studied suspensions the significant change in the absorption intensity, especially in the regions of wave numbers close to the corresponding nanocomposite oscillations, is observed. At the same time, it is found that the effects of nanocomposite influence on liquid media (FS) decreases with time and the activity of the corresponding suspensions drops. 

This technique has found the following applications in addition to those discussed in Sections 10.1 (resin cure studies on phenol urethane compositions) [65], 12.2 (photopolymer studies [66-68]), and 13.3 (phase transitions in PE) [66], Chapter 15 (viscoelastic and rheological properties), and Section 16.4 (heat deflection temperatures) epoxy resin-amine system [67], cured acrylate-terminated unsaturated copolymers [68], PE and PP foam [69], ethylene-propylene-diene terpolymers [70], natural rubbers [71, 72], polyester-based clear coat resins [73], polyvinyl esters and unsaturated polyester resins [74], polyimide-clay nanocomposites [75], polyether sulfone-styrene-acrylonitrile, PS-polymethyl methacrylate (PMMA) blends and PS-polytetrafluoroethylene PMMA copolymers [76], cyanate ester resin-carbon fibre composites [77], polycyanate epoxy resins [78], and styrenic copolymers [79]. 

Thermal diffusivity measurements have been reported for fiber-reinforced phenol formaldehyde resins, nylon 6,6, polypropylene, polymethyl methacrylate [81], and trifluoroethylene nanocomposites [82]. 

Jimenez, G.A. and Jana, S.C. (2007) Electrically conductive polymer nanocomposites of polymethyl methacrylate and carbon nanofibers prepared by chaotic mixing. Compos. Part A- Appl. Sci. Manuf., 38, 983-993. 

Mokofeng, T.G., Luyt, A.S., Pavlovic, V.P., Pavlovic, V.B., Dudic, D., Vlahovic, B., Djokovic, V., 2014. Ferroelectric nanocomposites of polyvinylidene fluoride/polymethyl methacrylate blend and BaTi03 particles fabrication of beta-crystal polymorph rich matrix through mechanical activation of the filler. Journal of Applied Physics 115, 084109. 

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