Poly(ester urethane)s with polycaprolactone soft segments: A morphological study

Kloss, Juliana Regina; Munaro, Marilda; Souza, Gabriel Pinto de; Gulmine, Joseane V.; Wang, Shu Hui; Zawadzki, Sônia Faria; Akcelrud, Leni

doi:10.1002/pola.10499

Cited by 76 publications

(52 citation statements)

References 34 publications

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“…There is a distinct difference between the PCLU and TSMPU. 43 PCLU is different from common polyurethane whose soft segments are highly crystalline at room temperature. 40 Different from the mechanism of thermal or photoinduced dual shape memory polyurethane, in our system, cinnamon groups are introduced into the hard segments, and can occur [2+2] cycloaddition under 365 nm UV light to form a network structure.…”

Section: ■ Experiments and Methodsmentioning

confidence: 99%

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

Wang

Yang

Chen

et al. 2013

ACS Appl. Mater. Interfaces

102

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A triple-shape memory polyurethane (TSMPU) with poly(ε-caprolactone) -diols (PCL-diols) as the soft segments and diphenyl methane diisocyanate (MDI), N,N-bis (2-hydroxyethyl) cinnamamide (BHECA) as the hard segments was synthesized via simple photo-crosslinking of cinnamon groups irradiated under λ > 280 nm ultraviolet (UV) light. Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance ( 1 H-NMR) and ultraviolet-visible absorption spectrum (UV−vis) confirmed the chemical structure of the material. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) results demonstrated that the photocrosslinked polymer possessed two transition temperatures, one is due to the melting point of the soft segment PCL-diols, and the other is due to the glass transition temperature. All these contributed to the cross-linked structure of the hard segments and resulted in an excellent triple-shape memory effect. Alamar blue assay showed that the material has good non-cytotoxicity and can be potentially used in biomaterial devices.

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Section: ■ Experiments and Methodsmentioning

confidence: 99%

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

Wang

Yang

Chen

et al. 2013

ACS Appl. Mater. Interfaces

102

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“…The double melting peaks in PEA2200 and PTMG2000 could be ascribed to different degree of ordering or size in the crystallites. 19 For the corresponding PUs, melting temperatures, particularly T pm s, shift to lower temperature with a sharp decrease in DH f . The shift factor of peak temperature (DT pm ) is obtained through the following equation.…”

Section: Polyurethane Characterizationmentioning

confidence: 98%

Morphology and water vapor permeability of temperature‐sensitive polyurethanes

Ding¹,

Tao

et al. 2007

J of Applied Polymer Sci

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A series of segmented polyurethanes (PUs) were prepared, in which five different polyols and hexamethylene diisocyanate were used as soft segments, and 4,4 0 -diphenylmethane diisocyanate, hydrophilic segment poly (ethylene glycol) 200 (PEG 200), and chain extender 1,4-butanediol were used as hard segment. Morphology of the PUs was investigated using differential scanning calorimetry, wide angle X-ray diffraction, polarizing microscopy, and transmission electron microscopy. Water vapor permeability of the membranes as a function of temperature was tested accordingly. Results show that the presence of PEG200 interferes the crystallization of hard segment in these PUs, and at the same time, increases phase compatibility between soft and hard segment in the PET-PU. It leads to a lower crystal melting temperature and degree of crystallinity of soft segment in the segmented PU than those of pure polyols, and no crystallization existing in hard segment. A morphological model is proposed, that is, aggregated soft-segment-rich domains can be observed clearly in the PUs with high crystallinity in soft segment, while identifiable hard domains are well-distributed in the soft segment domains in the PU with low crystallinity. Within the temperature range of crystal melting, water vapor permeability of the PU membranes increases significantly with increase of temperature. Such temperature-sensitive property is triggered by crystal melting of soft segment.

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“…[17,18] The objectives of the present study are to prepare biodegradable copolyesters ( Fig. 1) with a wide span of mechanical properties and their porous membranes and to evaluate the influence of the polymer structure in their biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Resorbable Hydrogel Membranes Useful for Tissue Engineering

Drumond

Rojas-Cabrera

Zhao

et al. 2006

Macromolecular Symposia

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Summary: New synthetic polymeric membranes of lactic acid were prepared with different chemical composition through copolymerization with e-caprolactone and ethylene oxide segments. The prepared copolymers were characterized by hydrogen and carbon-13 nuclear magnetic resonance ( 1 H-NMR and 13 C-NMR) and presented wide range of mechanical properties demonstrated by dynamic mechanical thermal analysis (DMA). Porous membranes were prepared by dissolving the polymer in the presence of salts (NaCl or hydroxyapatite) and/or lower mass poly(ethylene glycol) (Mn ¼ 600 or 1,000 g Á mol À1). The membranes presented new mechanical and biological characteristics and were suitable for cell penetration, anchorage, differentiation and proliferation. Adherence of cultured fibroblasts on membranes indicates biocompatibility.

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Poly(ester urethane)s with polycaprolactone soft segments: A morphological study

Cited by 76 publications

References 34 publications

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

Morphology and water vapor permeability of temperature‐sensitive polyurethanes

Preparation and Characterization of Resorbable Hydrogel Membranes Useful for Tissue Engineering

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