DSC analysis of post-yield deformed pbt. Effects of thermal history

Pandini, Stefano; Pegoretti, Alessandro; Riccò, T.

doi:10.1007/s10973-007-8917-7

Cited by 4 publications

(1 citation statement)

References 39 publications

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“…Unfortunately, the study did not consider the effect of the programming temperature being above or below the T g . Pandini et al showed that a certain amount of energy is stored within the material as a consequence of the specimen's cooling during the shape‐memory programming stage, which is later released over a large temperature range during recovery stage 32. This study also proposed that the ratio of stored energy to the energy required for deformation is about 0.5 for temperatures up to T g .…”

Section: Introductionmentioning

confidence: 92%

Partially constrained recovery of (meth)acrylate shape‐memory polymer networks

Lakhera

Yakacki

Nguyen

et al. 2012

J of Applied Polymer Sci

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The purpose of this study was to characterize the partial strain recovery of a thermoset shapememory polymer under a constraining stress. Three polymer networks were synthesized from tert-butyl acrylate and poly(ethylene glycol) dimethacrylate (PEGDMA) solutions. The molecular weight and the weight fraction of the PEGDMA crosslinking monomer was altered systematically to maintain a constant glass transition temperature (T g ¼ 54 C) but tailorable rubbery moduli, which varied by almost an order of magnitude for the three polymer networks (E 0 r ¼ 1.8-11.3 MPa). The shape-recovery behavior of the polymers under a constraining stress was characterized for programming temperature below (20 C) and above (70 C) the T g . The experiments revealed a peak in the recovered strain for samples programmed at 20 C. Recovered strain scaled linearly with the constraining stress by the rubbery modulus. The work performed by the shape-memory polymer networks was observed to be primarily a function of constraining stress and crosslinking density, while programming temperature had a relatively mild influence; however, the efficiency of the shape-memory effect was shown to be a function of constraining stress and programming temperature, but was independent of crosslinking density. Maximum work efficiencies (up to 45%) were observed for programming temperature of 70 C. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: 72-82, 2012

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Section: Introductionmentioning

confidence: 92%

Partially constrained recovery of (meth)acrylate shape‐memory polymer networks

Lakhera

Yakacki

Nguyen

et al. 2012

J of Applied Polymer Sci

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Thermal Characterization of Sepiolite Samples

Kök

2013

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Preparation and physicochemical characterization of Eudragit® RL100 Nanosuspension with potential for Ocular Delivery of Sulfacetamide

Mandal

2010

J Pharm Pharm Sci

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-Purpose. Polymeric nanosuspension was prepared from an inert polymer resin (Eudragit RL100) with the aim of improving the availability of sulfacetamide at the intraocular level to combat bacterial infections. Methods. Nanosuspensions were prepared by the solvent displacement method using acetone and Pluronic F108 solution. Drug to polymer ratio was selected as formulation variable. Characterization of the nanosupension was performed by measuring particle size, zeta potential, Fourier Transform infrared spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Powder X-Ray Diffraction (PXRD), drug entrapment efficiency and in vitro release. In addition, freeze drying, redispersibility and short term stability study at room temperature and at 4 0 C were performed. Results. Spherical, uniform particles (size range below 500 nm) with positive zeta potential were obtained. No significant chemical interactionbetween drug and polymer were observed in the solid state characterization of the freeze dried nanosuspension (FDN). Drug entrapment efficiency of the selected batch was increased by pH alteration and addition of polymethyl methacrylate in the formulation. The prepared nanosuspension exhibited good stability after storage at room temperature and at 4 0 C. Sucrose and mannitol were used as cryoprotectants and exhibited good water redispersibility of the FDN. Conclusion. The results indicate that the formulation of sulfacetamide in Eudragit RL100 nanosuspension could be utilized as potential delivery system for treating ocular bacterial infections. _____________________________________________________________________________________

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DSC analysis of post-yield deformed pbt. Effects of thermal history

Cited by 4 publications

References 39 publications

Partially constrained recovery of (meth)acrylate shape‐memory polymer networks

Partially constrained recovery of (meth)acrylate shape‐memory polymer networks

Thermal Characterization of Sepiolite Samples

Preparation and physicochemical characterization of Eudragit® RL100 Nanosuspension with potential for Ocular Delivery of Sulfacetamide

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