Effects of weak linkages on the thermal and oxidative degradation of poly(methyl methacrylates)

Kashiwagi, Takashi; Inaba, Atsushi; Brown, James E.; Hatäda, Koichi; Kitayama, Tatsuki; Masuda, Eiji

doi:10.1021/ma00162a010

Cited by 628 publications

(423 citation statements)

References 4 publications

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“…The plots show that pure PMMA (commercial; MW 120,000) degradation under the heating profiles used here is a two step process regardless of the atmosphere being used which is in agreement with results obtained by other workers [26]. The two steps in the degradation of PMMA have been attributed to scission at the vinyl terminated end and to random scission of the PMMA back bone respectively [27]. The initial stabilization of PMMA in air, although not very distinct in this work, has been reported elsewhere [28] and [29].…”

Section: Thermogravimetric Analysissupporting

confidence: 91%

“…The TGA and DTG curves for the degradation of PMMA and the composites in nitrogen ( Fig. 8) shows that the degradation occurs in two steps which were assigned to end initiation from the unsaturated double bonds at the end of the chain and random scission of the chain respectively [27]. The onset of the degradation process for pure PMMA, which corresponds to 10% mass loss, has an Ea value of 143 kJ mol −1 .…”

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confidence: 98%

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The effect of boron-containing layered hydroxy salt (LHS) on the thermal stability and degradation kinetics of poly (methyl methacrylate)

Majoni

Hossenlopp

2010

Polymer Degradation and Stability

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Abstract:A boron-containing layered hydroxy salt (LHS), ZHTMDBB, was prepared and compounded with a highly flammable synthetic polymer, poly (methyl methacrylate) {PMMA}, via melt blending: the composite structure was intercalated with poor dispersion. The effect of this LHS on the NOT THE PUBLISHED VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page.Polymer Degradation and Stability, Vol. 95, No. 9 (September 2010): pg. 1593-1604. DOI. This article is © Elsevier and permission has been granted for this version to appear in e-Publications@Marquette. Elsevier does not grant permission for this article to be further copied/distributed or hosted elsewhere without the express permission from Elsevier. 2 flammability, thermal stability and degradation kinetics of PMMA was investigated via cone calorimetry and thermogravimetric analysis. The addition of 3-10% by mass of ZHTMDBB to PMMA resulted in significant reduction of peak heat release rate (22-48%) of the polymer and improvements in thermal stability were observed in both air and nitrogen. Effective activation energies for the degradation process were evaluated using Flynn-Wall-Ozawa, Friedman, and Kissinger methods. All three methods indicated that the additive increased the activation energies of the first step of the degradation process in both air and nitrogen. Activation energies of the second step were lowered in nitrogen but were not significantly affected in air.

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Section: Thermogravimetric Analysissupporting

confidence: 91%

mentioning

confidence: 98%

The effect of boron-containing layered hydroxy salt (LHS) on the thermal stability and degradation kinetics of poly (methyl methacrylate)

Majoni

Hossenlopp

2010

Polymer Degradation and Stability

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“…There were no distinctive peaks present, other than trivial degradation attributed to the evaporation of water and trace of other solvents, during thermal decomposition in lower temperature (<300 o C) as shown in Fig. 6D, which represent weak linkages of PMMA 46 . The decomposition temperature was similar to that of poly(MMA-co-TMSPMA) 47 , and previous PMMA hybrids 28 .…”

Section: Resultsmentioning

confidence: 97%

Tailoring Mechanical Properties of Sol–Gel Hybrids for Bone Regeneration through Polymer Structure

Chung

Stevens

et al. 2016

Chem. Mater.

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Bioglass® was the first synthetic biomaterial that formed a chemical bond to bone. Although bioactive glass scaffolds can mimic bone's porous structure, they are brittle. Sol-gel derived hybrids could overcome this problem because their nanoscale co-networks of silica and organic polymer have the potential to provide unique physical properties and controlled homogenous biodegradation. Copolymers of methyl methacrylate (MMA) and 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) has been used as an organic source for hybrids to take advantage of its self-hardening property. However, the effect of well-defined poly(MMA-co-TMSPMA) architecture in the hybrid system has not been investigated. Here, linear, randomly branched and star shaped methacrylate based copolymers were synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization method. These copolymers were then used to fabricate hybrids. The 3-D polymer structure had a significant effect on mechanical properties, providing higher strain to failure while maintaining a compressive strength similar to sol-gel glass. Star copolymer-SiO2 hybrids had a modulus of toughness 9.6 fold greater, and Young's modulus 4.5 fold lower than a sol-gel derived bioactive glass. During in vitro cell culture, MC3T3-E1 osteoblast precursor cells adhered on the surface regardless of the polymer structure. Introducing star polymers to inorganic-organic hybrids opens up possibilities for the fine-tuning physical properties of bone scaffold materials.

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“…The sensitivity of electronic structure of graphene to the removal of polymer residue can be harnessed to tailor the properties of graphene. Generally, thermal degradation of polymers like PMMA is a complex radical chain reaction [341], which proceeds in three steps [342], as seen in Figure 18(b). Lin et al [329] employed TEM in combination with Raman spectroscopy to study the thermal decomposition of PMMA (see Figure 18(a)).…”

Section: Modulation Of Structural Defects In Graphenementioning

confidence: 99%

Structure of graphene and its disorders: a review

Gao

Lee

et al. 2018

Science and Technology of Advanced Materials

432

167

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Monolayer graphene exhibits extraordinary properties owing to the unique, regular arrangement of atoms in it. However, graphene is usually modified for specific applications, which introduces disorder. This article presents details of graphene structure, including sp2 hybridization, critical parameters of the unit cell, formation of σ and π bonds, electronic band structure, edge orientations, and the number and stacking order of graphene layers. We also discuss topics related to the creation and configuration of disorders in graphene, such as corrugations, topological defects, vacancies, adatoms and sp3-defects. The effects of these disorders on the electrical, thermal, chemical and mechanical properties of graphene are analyzed subsequently. Finally, we review previous work on the modulation of structural defects in graphene for specific applications.

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Effects of weak linkages on the thermal and oxidative degradation of poly(methyl methacrylates)

Cited by 628 publications

References 4 publications

The effect of boron-containing layered hydroxy salt (LHS) on the thermal stability and degradation kinetics of poly (methyl methacrylate)

The effect of boron-containing layered hydroxy salt (LHS) on the thermal stability and degradation kinetics of poly (methyl methacrylate)

Tailoring Mechanical Properties of Sol–Gel Hybrids for Bone Regeneration through Polymer Structure

Structure of graphene and its disorders: a review

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