Crystallization, melting behavior, and wettability of poly(ε‐caprolactone) and poly(ε‐caprolactone)/ poly(<i>N</i>‐vinylpyrrolidone) blends

Xing, Zhimin; Yang, Guisheng

doi:10.1002/app.30069

Cited by 10 publications

(4 citation statements)

References 61 publications

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“…PCL is a semicrystalline polymer; crystalline regions are constituted by orthorhombic unit cells . The X‐ray diffractometric pattern of PCL has basically three peaks associated to the planes (110), (111), and (200) around 2θ values of 21.4°, 21.9°, and 23.6°, respectively . In Figure (a,b), the PCL and all the composite diffractometric patterns showed the three characteristic peaks.…”

Section: Resultsmentioning

confidence: 97%

Fabrication of PCL/β‐TCP scaffolds by 3D mini‐screw extrusion printing

Dávila

Freitas

Neto

et al. 2015

J of Applied Polymer Sci

107

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Scaffolds of polycaprolactone (PCL) and PCL composites reinforced with b-tricalcium phosphate (b-TCP) were manufactured aiming potential tissue engineering applications. They were fabricated using a three-dimensional (3D) mini-screw extrusion printing, a novel additive manufacturing process, which consists in an extrusion head coupled to a 3D printer based on the Fab@Home equipment. Thermal properties were obtained by differential scanning calorimetry and thermogravimetric analyses. Scaffolds morphology were observed using scanning electron microscopy and computed microtomography; also, reinforcement presence was observed by X-ray diffraction and the polymer chemical structure by Fourier transform infrared spectroscopy. Mechanical properties under compression were obtained by using a universal testing machine and hydrophilic properties were studied by measuring the contact angle of water drops. Finally, scaffolds with 55% of porosity and a pore size of 450 lm have shown promising mechanical properties; the b-TCP reinforcement improved mechanical and hydrophilic behavior in comparison with PCL scaffolds. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43031.

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Section: Resultsmentioning

confidence: 97%

Fabrication of PCL/β‐TCP scaffolds by 3D mini‐screw extrusion printing

Dávila

Freitas

Neto

et al. 2015

J of Applied Polymer Sci

107

View full text Add to dashboard Cite

show abstract

“…Nevertheless, the low melting point and modulus, poor stability, and easy to deformation of PCL have restrict its application . Therefore, many attentions have been paid on the PCL based polymer blends in order to solve aforementioned shortcomings . For instance, Wischke et al investigated the PCL/poly[(e‐caprolactone)‐ co ‐glycolide] blends in which the advantageous properties of both components could selectively be combined .…”

Section: Introductionmentioning

confidence: 99%

“…Xing et al investigated crystallization, melting behavior, and wettability of PCL and PCL/poly(N‐vinylpyrrolidone) (PVP) blends. They found that PVP had a restrain effect on the crystallization of PCL and the hydrophilic properties of PCL/PVP blends were improved compared with pure PCL . Moreover, compounding PCL with layer silicate, carbon nanotubes, or fumed silica has been widely investigated.…”

Section: Introductionmentioning

confidence: 99%

Toward environment‐friendly composites of poly(ε‐caprolactone) reinforced with stereocomplex‐type poly(l‐lactide)/poly(d‐lactide)

Dong

Han

et al. 2013

J of Applied Polymer Sci

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In this work, stereocomplex-poly(L-and D-lactide) (sc-PLA) was incorporated into poly(e-caprolactone) (PCL) to fabricate a novel biodegradable polymer composite. PCL/sc-PLA composites were prepared by solution casting at sc-PLA loadings of 5-30 wt %. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) demonstrated the formation of the stereocomplex in the blends. DSC and WAXD curves also indicated that the addition of sc-PLA did not alter the crystal structure of PCL. Rheology and mechanical properties of neat PCL and the PCL/sc-PLA composites were investigated in detail. Rheological measurements indicated that the composites exhibited evident solid-like response in the low frequency region as the sc-PLA loadings reached up to 20 wt %. Moreover, the long-range motion of PCL chains was highly restrained. Dynamic mechanical analysis showed that the storage modulus (E 0 ) of PCL in the composites was improved and the glass transition temperature values were hardly changed after the addition of sc-PLA. Tensile tests showed that the Young's modulus, and yield strength of the composites were enhanced by the addition of sc-PLA while the tensile strength and elongation at break were reduced.

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“…In addition, stearyl side chains provided by stearyl acrylate were selected as an example for grafted chains of low molecular weight. N-vinylpyrrolidone (NVP) was selected to create the backbone of the swollen polymer networks as polymers of NVP exhibit high wettability. , A low molecular weight and hydrophilic cross-linker, oligo(ethylene glycol) dimethacrylate (oEG 200 DMA), was selected to avoid its crystallization and to support the swelling in water. The resulting hydrogels were characterized in terms of swelling behavior, thermal and mechanical properties, and the capability of a TSE was explored.…”

Section: Introductionmentioning

confidence: 99%

Thermally-Induced Triple-Shape Hydrogels: Soft Materials Enabling Complex Movements

Nöchel

Behl

Balk

et al. 2016

ACS Appl. Mater. Interfaces

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Shape-memory hydrogels enable directed movements of a specimen in response to temperature, whereby crystallizable switching segments incorporated as side chains resulted in constant degrees of swelling during the shape-memory cycle. Here we report about hydrogels exhibiting a thermally induced triple-shape effect that allows complex movements of soft materials with two almost independent shape changes. Potential applications for those soft triple-shape materials are two-step self-unfolding devices or temperature-sensitive hydrogel actuators, for example, smart valves for flow rate control in aqueous media. Series of hydrogels with two different hydrophobic crystallizable switching segments were prepared. The degrees of swelling of the triple-shape hydrogels were not affected for different shapes or temperatures, which avoided in this way interferences on the shape shifts. During the two-step programming procedure, two distinct shapes can be implemented as reflected by shape fixity ratios of generally >50%. Structural analysis of the switching domains during the triple-shape cycle by means of X-ray scattering indicates that longer side chains gain lower orientation after deformation and that shorter side chains orient perpendicular to the hydrophilic main chain. Furthermore, it is observed that increased orientation of the switching domains is not a key requirement for adequate shape fixity and recovery ratios of the triple-shape effect in hydrogels, thus longer side chains can be utilized as switching segments in other shape-memory hydrogels.

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Crystallization, melting behavior, and wettability of poly(ε‐caprolactone) and poly(ε‐caprolactone)/ poly(N‐vinylpyrrolidone) blends

Cited by 10 publications

References 61 publications

Fabrication of PCL/β‐TCP scaffolds by 3D mini‐screw extrusion printing

Fabrication of PCL/β‐TCP scaffolds by 3D mini‐screw extrusion printing

Toward environment‐friendly composites of poly(ε‐caprolactone) reinforced with stereocomplex‐type poly(l‐lactide)/poly(d‐lactide)

Thermally-Induced Triple-Shape Hydrogels: Soft Materials Enabling Complex Movements

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