High glass transition temperatures of poly(methyl methacrylate) prepared by free radical initiators

Teng, Honghui; Koike, Kotaro; Zhou, Dingying; Satoh, Zen; Koike, Yasuhiro; Okamoto, Yoshiyuki

doi:10.1002/pola.23154

Cited by 56 publications

(41 citation statements)

References 7 publications

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“…Another important aspect is that the glass transition temperature may vary between 45 °C for syndiotactic PMMA (the ester groups are alternated around the chain) and 160 °C in the case of an isotactic PMMA (the ester groups are aligned on the same side of the chain). However, common PMMA is atactic, with a glass transition temperature range between 80 °C and 160 °C [32,35,36]. Furthermore, the elastic modulus of a material is defined as the slope of the linear elastic part of the stress-strain curve.…”

Section: Resultsmentioning

confidence: 99%

Investigations on laser printing of microcapacitors using poly (methyl methacrylate) dielectric thin films for organic electronics applications

Constantinescu

Rapp

Delaporte

et al. 2016

Applied Surface Science

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Section: Resultsmentioning

confidence: 99%

Investigations on laser printing of microcapacitors using poly (methyl methacrylate) dielectric thin films for organic electronics applications

Constantinescu

Rapp

Delaporte

et al. 2016

Applied Surface Science

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“…42,44,58 It is also reported that the T g of PMMA depends upon the degree of tacticity (isotactic, heterotactic, syndiotactic or atactic), thermal history and the type of free radical initiator used during processing. 38,39 Since the ceramics and polymers have different heat capacities, DSC analysis is important to understand the change in the heat flow behavior due to the addition of particles into the polymer matrix. For calculating glass transition (T g ) temperature, the DSC data obtained from the second run were taken into account.…”

Section: Resultsmentioning

confidence: 99%

“…37 The introduction of fillers into the polymer matrix can also improve the thermal and mechanical properties. [38][39][40][41] It is interesting to note that the addition of small amount of graphite particles (1-5 wt.%) in PMMA has increased the onset degradation temperature of the composite by 20 C. 42 It is also observed that the stability of the composites has increased by 13.5 C as compared to that of pure PMMA, when the very low level (6.1% by weight) of nanosized SiO 2 (23 nm) was added into the PMMA. When the size of the crystallites was further reduced (17 nm), enhancement in the thermal stability has been achieved.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sr2TiMnO6 fillers on mechanical, dielectric and thermal behaviour of PMMA polymer

et al. 2015

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Composites of poly(methyl methacrylate) (PMMA) and Sr 2 TiMnO 6 (STMO) were fabricated via melt mixing followed by hot pressing technique. These were characterized using X-ray diffraction (XRD), thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC), thermo mechanical analysis (TMA) and impedance analyser for their structural, thermal and dielectric properties. The coefficient of thermal expansion (CTE) was measured between 40 C and 100 C for pure PMMA is 115.2 ppm/ C, which was decreased to 78.58 ppm/ C when the STMO content was increased to 50 wt.% in PMMA. There was no difference in the glass transition (T g ) temperature of the PMMA polymer and their composites. However, the FTIR analysis indicated possible interaction between the PMMA and STMO. The density and the hardness were increased as the STMO content increased in the PMMA matrix. Permittivity was found to be as high as 30.9 at 100 Hz for the PMMAþSTMO-50 wt.% composites, indicating the possibility of using these materials for capacitor applications. The thermal stability of polymer was enhanced by incorporation of STMO fillers.

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“…The identical tan δ curve peak at 105 °C for PMMA and PMMA/CAP10% represents the Tg for atactic miscible PMMA (Bosma et al 1988;Teng et al 2009;Olabis 2012). The decrease in the values of E' and E" for the PMMA/CAP10% blend is a sign of more freedom in the polymer chain movement (Heijboer et al 1987), leading to decreased hardness of the blend.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 96%

Miscible Transparent Polymethylmethacrylate/Cellulose Acetate Propionate Blend: Optical, Morphological, and Thermomechanical Properties

Raouf¹,

Wahab²,

Ibrahim³

et al. 2016

BioResources

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To obtain a high transmittance blend within ultraviolet and visible regions, various transparent samples of ascending percentages of polymethylmethacrylate (PMMA)/cellulose acetate propionate (CAP) were prepared by melt blending using a twin screw extruder. These blends were characterised by ultraviolet-visible spectroscopy, and the curves illustrated that the blending ratio of 10% CAP in PMMA meets the required purpose. The morphological, mechanical, and thermal properties for pure PMMA and the PMMA/CAP 10% blend were investigated using X-ray diffraction, scanning electron microscopy, dynamic mechanical analysis, and thermogravimetric analysis. The results showed that the PMMA/CAP 10% blend has an amorphous structure and low stiffness than pure PMMA. The miscible PMMA/CAP 10% blend exhibited mechanical stability below the glass transition temperature (Tg), with a slight increase in Tg value relative to that of pure PMMA. The study also demonstrated that the intermolecular interaction between blend elements has an effective influence on the physical properties of the blend.

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High glass transition temperatures of poly(methyl methacrylate) prepared by free radical initiators

Cited by 56 publications

References 7 publications

Investigations on laser printing of microcapacitors using poly (methyl methacrylate) dielectric thin films for organic electronics applications

Investigations on laser printing of microcapacitors using poly (methyl methacrylate) dielectric thin films for organic electronics applications

Effect of Sr2TiMnO6 fillers on mechanical, dielectric and thermal behaviour of PMMA polymer

Miscible Transparent Polymethylmethacrylate/Cellulose Acetate Propionate Blend: Optical, Morphological, and Thermomechanical Properties

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