Thermally-induced Crack Healing in Poly(Methyl Methacrylate)

2002 ◽  
Vol 17 (6) ◽  
pp. 1335-1340 ◽  
Author(s):  
Jane-Sang Shen ◽  
Julie P. Harmon ◽  
Sanboh Lee
Keyword(s):  
Activation Energy ◽  
Methyl Methacrylate ◽  
Crack Closure ◽  
Healing Process ◽  
Fourth Power ◽  
Surface Cracks ◽  
Crack Healing ◽  
Closure Rate ◽  
Thermally Induced ◽  
Poly Methyl Methacrylate

A microscopic theory of thermally induced crack healing in poly(methyl methacrylate) is presented. Both laser-induced cylindrical cracks and knife-induced surface cracks were analyzed. For a given temperature, the crack closure rate was constant for both types of cracks. However, the crack closure rate was lower for samples with cylindrical cracks than for those with surface cracks. The former exhibited higher activation energy for crack closure than the latter, because the knife-induced cracks had sharper crack tips. Fracture stress was proportional to surface crack healing time to the one-fourth power for thermal healing at a given temperature. Based on the reptation model of polymer chains, the activation energy of chain diffusion was calculated. The healing process was monitored via fractography and crack closure was confirmed. The results were compared with solvent healing and thermal healing in the literature.

Phase Separation in Liquid-Crystalline Copolymer/Poly(methyl methacrylate) Blends

1995 ◽  
Vol 60 (11) ◽  
pp. 1869-1874 ◽  
Author(s):  
Anatoly E. Nesterov ◽  
Yuri S. Lipatov ◽  
Vitaly V. Horichko
Keyword(s):  
Phase Separation ◽  
Methyl Methacrylate ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Ethylene Terephthalate ◽  
Crystalline Polymer ◽  
Scattering Method ◽  
Thermally Induced ◽  
Poly Methyl Methacrylate ◽  
Copolymer Poly

The phase separation in the blends of poly(methyl methacrylate) and liquid-crystalline polymer (copolymer of ethylene terephthalate and p-hydroxybenzoic acid) has been studied by the light scattering method and the cloud point curves have been obtained. Simultaneously some morphological features of the blends have been observed. It was found that the initial blends are in the state of forced compatibility and that thermally induced phase separation occurs by the mechanism of spinodal decomposition but presumably in the non-linear regime.

Effect of graphene on the absorption of methanol and crack healing in poly(methyl methacrylate)-based composites

Soft Matter ◽  
2018 ◽  
Vol 14 (36) ◽  
pp. 7526-7533
Author(s):  
Zu-wen Lin ◽  
Fuqian Yang ◽  
Sanboh Lee
Keyword(s):  
Methyl Methacrylate ◽  
Crack Healing ◽  
Poly Methyl Methacrylate

Methanol-assisted crack healing in PMMA-based composites.

Ethanol-induced crack healing in poly(methyl methacrylate)

1994 ◽  
Vol 32 (7) ◽  
pp. 1217-1227 ◽  
Author(s):  
Peng-Peng Wang ◽  
Sanboh Lee ◽  
Julie P. Harmon
Keyword(s):  
Methyl Methacrylate ◽  
Crack Healing ◽  
Poly Methyl Methacrylate

Methanol-assisted crack healing in UV-irradiated poly(methyl methacrylate)

2017 ◽  
Vol 24 (11) ◽  
Author(s):  
Han-Ren Hsu ◽  
Wenxin Cao ◽  
Fuqian Yang ◽  
Sanboh Lee
Keyword(s):  
Methyl Methacrylate ◽  
Crack Healing ◽  
Poly Methyl Methacrylate
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