Crack healing in poly(methyl methacrylate) induced by co-solvent of methanol and ethanol

Hsieh, Hsin-Chan; Yang, Tzong Jer; Lee, Sanboh

doi:10.1016/s0032-3861(00)00407-9

Cited by 28 publications

(12 citation statements)

References 24 publications

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“…Although the above two studies used different approaches, they had the same interpretation of gas transport in polyimide. Furthermore, Hsieh et aL (41) found that crack tip recession of poly(methy1 methacrylate) arising from a mixture of methanol with ethanol is controlled by Case I1 transport based on the present model.…”

Section: Type Ofmentioning

confidence: 54%

The mass transport of ethyl acetate in syndiotactic polystyrene

Chiang

Chau

Lee

2002

Polymer Engineering & Sci

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The mass transport of ethyl acetate in syndiotactic polystyrene (sPS) has been studied. Two groups of specimens were prepared using press-cooling and waterquenching. The press-cooled and water-quenched specimens were identified as crystalline and amorphous structures, respectively, by X-ray dim-action. The weight gain of ethyl acetate in sPS was monitored at temperatures from 50°C to 70°C. The crystallinity of a press-cooled specimen prior to solvent sorption was greater than that after solvent sorption. However, solvent-induced crystallization was observed in the water-quenched specimen. The transport of ethyl acetate in both presscooled and water-quenched specimens was anomalous and consisted of two stages. Each stage of the sorption curves was well fitted with Harmon's model. Both the diffusion coefficient and velocity component satisfy Arrhenius behavior. For the press-cooled specimen, fluxes of Case I and Case I1 transport flow from the outer surface to the center, but for the water-quenched specimen, the solvent is squeezed out. Pure Case I1 transport did not appear in the water-quenched specimen.

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Section: Type Ofmentioning

confidence: 54%

The mass transport of ethyl acetate in syndiotactic polystyrene

Chiang

Chau

Lee

2002

Polymer Engineering & Sci

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“…Solvents such as ethanol and methanol were used to seal the cracks of thermoplastic polymers (i.e., poly(methyl methacrylate)) when the polymer was heated. [9][10][11][12][13][14] This healing mechanism involves wetting of the polymer surface and swelling of the bulk polymer material, which leads to reptation and interlocking of the chains across the crack plane to recover virgin mechanical properties and heal a crack. More recent research has explored the effects of tetrahydrofuran (THF) in epoxy-amine polymerizations.…”

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confidence: 99%

Solvent-Promoted Self-Healing Epoxy Materials

et al. 2007

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“…The particular thermoplastic matrix studied in this work is PMMA. Prior work in solvent welding of PMMA used methanol (n = 1.33) and ethanol (n = 1.36),18, 19 but these solvents are not readily encapsulated and are poorly index matched to PMMA (n = 1.49). Useful solvents for solvent welding PMMA with refractive indices similar to PMMA include ethylphenyl acetate (EPA, n = 1.50), and dibutyl phthalate (DBP, n = 1.49).…”

Section: Resultsmentioning

confidence: 99%

Transparent Self‐Healing Polymers Based on Encapsulated Plasticizers in a Thermoplastic Matrix

Jackson

Bartelt

Braun

2011

Adv Funct Materials

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A self‐healing approach for optically transparent thermoplastic polymers, based on plasticizer‐induced solvent welding, is reported. For the specific system investigated, dibutylphthalate (DBP) filled urea‐formaldehyde capsules are dispersed in a polymethylmethacrylate (PMMA) matrix. Upon a damage event, DBP is released into the crack, and locally plasticizes and swells the polymer, enabling it to remend. Two challenges are addressed to maintain optical transparency: minimization of light scatter from the capsules in the polymer matrix and minimization of light scatter from the healed polymer. PMMA films containing DBP capsules have good transmissive properties as a result of the close index match between PMMA and DBP. The transmission properties are better than, for example, when DBP capsules are dispersed into a poorly index matched matrix, such as polystyrene. In the DBP PMMA system, the healed material is inherently index matched to the polymer matrix and thus the polymer's original optical properties are largely restored. Self‐healing using both small capsules, 1.5 μm in diameter, and large capsules, 75 μm in diameter is demonstrated. Smaller capsules are particularly important for thin polymer films which are not thick enough to hold the larger capsules. Polymer films with smaller capsules also have very good transmission properties due to a minimization of light scattering by the small size of the capsules. Large capsules enable healing of larger damage events, but do inherently result in some light scattering. This plasticizer‐based approach to self‐healing is shown to enable recovery of the protective properties and a portion of the mechanical properties of a polymeric film.

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Crack healing in poly(methyl methacrylate) induced by co-solvent of methanol and ethanol

Cited by 28 publications

References 24 publications

The mass transport of ethyl acetate in syndiotactic polystyrene

The mass transport of ethyl acetate in syndiotactic polystyrene

Solvent-Promoted Self-Healing Epoxy Materials

Transparent Self‐Healing Polymers Based on Encapsulated Plasticizers in a Thermoplastic Matrix

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