Transport of Alcohols in Deformed Pmma

Harmon, Jeffrey; Li, J. C. M.

doi:10.1111/j.1749-6632.1981.tb55674.x

Cited by 3 publications

(4 citation statements)

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“…Traditionally, PMMA is not well known for its SME, although its shape recovery ability induced by either heating or solvent absorption (limited to small strain) has actually been reported in the literature [171][172][173]. Our recent experiments revealed that the recoverable strain in PMMA (in free recovery) can be over 100% in uniaxial tension and over 50% in uniaxial compression, while the maximum actuation stress in constrained recovery in uniaxial tension can be over 2 MPa after optimization [97].…”

Section: Chapter 5 Thermo-/chemo-responsive Sme In Pmmamentioning

confidence: 85%

“…It should be pointed out that PMMA is a conventional engineering polymer. However, its shape memory phenomenon induced by either heating or solvent absorption is only briefly reported in the past and all limited to small strain range [170][171][172].The sample was coated with a thin layer of gold and then heated to 140°C, which is above its T g . It was found that heating to below 140 o C did not result in any visible wrinkles at all.…”

Section: Theory Of Wrinklingmentioning

confidence: 99%

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Shape memory technology : working mechanisms, modeling and surface patterning application

Zhao¹

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A new way to classify shape memory materials (SMMs) was proposed based on the underlying working mechanisms behind the shape memory effect (SME). Three categories, namely dual-state mechanism, dual-component mechanism, and partial-transition mechanism, were discussed in details. Based on this, the concept of advanced shape memory technology was proposed to enable the SME in materials, to design/synthesize new SMMs with tailored features, and to optimize the SME in materials. Previously, SME is considered as a unique behavior in some certain materials. In this study, based on ASMT, SME can be achieved in a range of materials, which are not the traditional SMMs. A generic 3-D model was developed to simulate the shape memory behavior in polymeric SMMs. This model was verified by a series of experiments. In addition, this model was applied for optimization of the SME. The thermo-/chemo-responsive SME in poly(methyl methacrylate) (PMMA) were systematically studied by experiments and simulation. Based on above study on the fundamentals, different surface patterning methods were developed to fabricate micro/nano-sized surface features, including well-controllable wrinkled patterns, PMMA microlens arrays, reversible surface patterns and 3-D surface patterns.

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Section: Chapter 5 Thermo-/chemo-responsive Sme In Pmmamentioning

confidence: 85%

Section: Theory Of Wrinklingmentioning

confidence: 99%

Shape memory technology : working mechanisms, modeling and surface patterning application

Zhao¹

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“…The velocity of methanol penetration is faster in the compression direction than that in its perpendicular direction [6]; even in perpendicular direction it is still faster than that in PMMA without any pre-deformation [6]. In addition, swelling induced shape recovery (i.e., chemo-responsive shape memory effect) has been reported [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that alcohol could induce significant swelling in PMMA [3][4][5], in which the alcohol penetration in PMMA without any pre-deformation is a kind of Case II diffusion behavior [5,8], and it is isotropic. Since 1980s, anisotropic methanol transportation in pre-compressed PMMA was observed [6,9,10]. The velocity of methanol penetration is faster in the compression direction than that in its perpendicular direction [6]; even in perpendicular direction it is still faster than that in PMMA without any pre-deformation [6].…”

Section: Introductionmentioning

confidence: 99%

Ethanol Induced Shape Recovery and Swelling in Poly(methyl methacrylate) and Applications in Fabrication of Microlens Array

Zhao

Wang

Huang

et al. 2012

Advances in Science and Technology

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The transportation phenomenon of ethanol in pre-deformed poly(methyl methacrylate) (PMMA) is systematically investigated. Two different phenomena simultaneously occur during this process. One is shape recovery, which is resulted from the ethanol induced softening and plasticization of PMMA. The other is swelling, which is produced by the ethanol induced molecular relaxation. Based on this study, a novel surface patterning method is proposed to fabricate PMMA microlens arrays in a simple and cost-effective manner.

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Poly(methyl methacrylate) for active disassembly

Purnawali¹,

Xu²,

Zhao³

et al. 2012

Smart Mater. Struct.

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This paper focuses on the applications of poly(methyl methacrylate) (PMMA), one of the most commonly used engineering polymers, for active disassembly (AD). PMMA was first characterized by a series of thermo-mechanical tests to find the suitable programming temperatures and its shape memory characteristics. Four releasable fasteners were then developed, and tested, i.e. active screw, active joint, active snap-fit and active tab. It was successfully demonstrated that PMMA is a promising candidate for AD. Moreover, programmed AD has been achieved as well through a series of temperature-activated actions during the disassembly process. These techniques are applicable to other engineering polymers for AD and programmed AD.

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Transport of Alcohols in Deformed Pmma

Cited by 3 publications

References 0 publications

Shape memory technology : working mechanisms, modeling and surface patterning application

Shape memory technology : working mechanisms, modeling and surface patterning application

Ethanol Induced Shape Recovery and Swelling in Poly(methyl methacrylate) and Applications in Fabrication of Microlens Array

Poly(methyl methacrylate) for active disassembly

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