Improvement of thermal stability and gamma‐ray absorption in microwave absorbable poly(methyl methacrylate)/graphene nanoplatelets nanocomposite

2021 ◽  
pp. 50897
Author(s):  
Tayfun Bel ◽  
Mahmut Muhammettursun ◽  
Elif Kocacinar ◽  
Ecem Erman ◽  
Fuat Berke Gul ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Methyl Methacrylate ◽  
Gamma Ray ◽  
Graphene Nanoplatelets ◽  
Poly Methyl Methacrylate

scholarly journals Validation of EFFTRAN for efficiency transfer to distant geometries and volume sources

2021 ◽  
Author(s):  
H. Ramebäck ◽  
S. Jonsson ◽  
T. Vidmar
Keyword(s):  
Methyl Methacrylate ◽  
Gamma Ray ◽  
Germanium Detector ◽  
Gamma Ray Spectrometry ◽  
Volume Source ◽  
Two Stage ◽  
Poly Methyl Methacrylate ◽  
Fit For Purpose

AbstractThe efficiency transfer procedure from a geometry where a volume source was placed directly on the endcap of a germanium detector to three different distant geometries was carried out using the EFFTRAN code. One of these distant geometries included absorbers consisting of poly(methyl methacrylate). The efficiency transfer to this geometry therefore had to be realized as a two-stage transfer, since a direct efficiency transfer is not possible using EFFTRAN in such a case. Efficiency transfer to all three distant geometries yielded results which can be considered as fit-for-purpose in e.g. most of the applications of gamma ray spectrometry.

scholarly journals Grafting from versus Grafting to Approaches for the Functionalization of Graphene Nanoplatelets with Poly(methyl methacrylate)

2017 ◽  
Vol 50 (18) ◽  
pp. 7070-7079 ◽  
Author(s):  
Noelia Rubio ◽  
Heather Au ◽  
Hannah S. Leese ◽  
Sheng Hu ◽  
Adam J. Clancy ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Graphene Nanoplatelets ◽  
Poly Methyl Methacrylate ◽  
Grafting From

scholarly journals Mono-acrylated isosorbide as a bio-based monomer for the improvement of thermal and mechanical properties of poly(methyl methacrylate)

RSC Advances ◽  
2019 ◽  
Vol 9 (61) ◽  
pp. 35532-35538 ◽  
Author(s):  
Dinghua Yu ◽  
Juan Zhao ◽  
Wenjuan Wang ◽  
Jingjie Qi ◽  
Yi Hu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Methyl Methacrylate ◽  
Thermal And Mechanical Properties ◽  
Poly Methyl Methacrylate

With bio-based monoester of acrylated isosorbide as the comonomer, copolymerized poly(methyl methacrylate) showed improved thermal stability and mechanical properties.

Synthesis and thermal decomposition kinetics of poly(methyl methacrylate)-b-poly(styrene) block copolymers

2015 ◽  
Vol 30 (5) ◽  
pp. 691-706 ◽  
Author(s):  
Xinghua Guan ◽  
Xiaoyan Ma ◽  
Hualong Zhou ◽  
Fang Chen ◽  
Zhiguang Li
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Weight Loss ◽  
Block Copolymers ◽  
Methyl Methacrylate ◽  
Terminal Group ◽  
Loss Ratio ◽  
Poly Methyl Methacrylate ◽  
Second Stage ◽  
Weight Loss Ratio

Two diblock copolymers of poly(methyl methacrylate)- block-poly(styrene) with chlorine as terminal group (PMMA- b-PS-Cl) were synthesized via two-step atom transfer radical polymerization. The structures of the block copolymers were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, and gel permeation chromatography. Thermal properties including glass transition temperature ( Tg) and thermal stability were studied by differential scanning calorimetry and thermogravimetric analysis (TGA), respectively. The block copolymers of PMMA- b-PS-Cl exhibited two glass transitions, which were attributed to the Tgs of PMMA and PS segments, respectively. According to TGA, thermal decompositions of PMMA macro-initiator and PMMA- b-PS-Cl block copolymers had two stages. The weight loss ratio in the second stage was more significant than that in the first stage, which may be attributed to the separation of the halogen atom from the terminal group and the formation of a double bond. The breaking down of the backbone dominates in the second stage in which the weight loss ratio was more than 70%, represented the main stage of pyrolysis. It was found that the introduction of the PS chain remarkably enhanced the thermal stability of the copolymer, thus endowing the block copolymers high activation energy for thermal decomposition. On the other hand, the remaining two pyrolysis procedures further indicated that thermodynamic mechanism didn’t change due to the introduction of PS segments.

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