Miscibility, UV resistance, thermal degradation, and mechanical properties of PMMA/SAN blends and their composites with MWCNTs

Abstract

Poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) (PMMA/SAN) blends, with varying concentrations, were prepared by melt-mixing technique. The miscibility is ensured by fixing the acrylonitrile (AN) content of styrene acrylonitrile (SAN) as 25% by weight. The blends were transparent as well. The Fourier transform infrared spectroscopic (FTIR) studies did not reveal any specific interactions, supporting the well accepted 'copolymer repulsion effect' as the driving mechanism for miscibility. Addition of SAN increased the stability of PMMA towards ultraviolet (UV) radiations and thermal degradation. Incorporation of even 0.05% by weight of multi-walled carbon nanotubes (MWCNTs) significantly improved the UV absorbance and thermal stability. Moreover, the composites exhibited good strength and modulus. However, at higher concentrations of MWCNTs (0.5 and 1% by weight) the thermomechanical properties experienced deterioration, mainly due to the agglomeration of MWCNTs. It was observed that composites with 0.05% by weight of finely dispersed and well distributed MWCNTs provided excellent protection in most extreme climatic conditions. Thus, PMMA/SAN/MWCNTs composites can act as excellent light screens and may be useful, as cost-effective UV absorbers, in the outdoor applications.

Physical, mechanical, thermal, and dynamic characterization of carbon nanotubes incorporated poly(methyl methacrylate)-based denture implant

“…24 Similar results were previously reported for PMMA. 25 The DSC scan in Figure 5 revealed similar exothermic region for the control and the experimental groups occurring at & 300 C (Figure 5). One possible explanation behind it could be the agglomeration of CNTs in the PMMA matrix as evident in Figure 2(d) to (f).…”

Thermomechanical, water absorption, ultraviolet resistance and laser‐assisted electroless plating behavior of Cu2O and melamine–formaldehyde‐coated sisal fiber‐modified poly(lactic acid) composites

“…Similarly, the absorption of neat PLA rapidly decreases from 100 to <12% at 400 nm. Therefore, neat PLA cannot shield high energy UV radiations [38,39]. On the other hand, the % transmittance remains zero till 600 nm for the samples containing 30 pph Cu 2 O.…”

Polioksimetilen (POM) / polipropilen (PP) harmanlarının uyumlaştırılması ve mekanik, reolojik ve katı-hal sünme özelliklerinin incelenmesi

“…Farklı polimer malzemelerin fiziksel yöntemlerle harmanlanarak hedef kullanıma yönelik optimum özelliklere sahip yeni polimerik malzemelerin geliştirilmesi hem endüstriyel anlamda hem de bilimsel çalışmalarda ilgi çeken bir konu olmuştur. Polimer harmanlama ile ilgili yapılan çalışmalar incelendiğinde ise bu çalışmalarda genellikle maliyetlerin düşürülmesi [1,2], işlenebilirliğinin artırılması [1,2], mekanik özelliklerin optimizasyonu [3][4][5] ya da UV dayanımı [6,7], elektriksel iletkenlik [8,9], şekil hafıza özelliği [10,11] gibi fonksiyonel özelliklerin sağlanabilmesinin amaçlandığı görülmektedir. Çok fazlı polimer harmanların nihai özellikleri ise kullanılan polimerik bileşimlerin özellikleri kadar bu fazlar arası yapışma/uyum ve oluşan harmanın morfolojik özellikleri tarafından da belirlenmektedir [1,2].…”