Effect of thermal annealing on mechanical properties of polyelectrolyte complex nanofiber membranes

Wang, Zelong; Cai, Ning; Dai, Qin; Li, Chao; Hou, Dajun; Luo, Xiaogang; Xue, Yanan; Yu, Faquan

doi:10.1007/s12221-014-1406-2

Cited by 29 publications

(30 citation statements)

References 33 publications

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“…To investigate the effect of microwave annealing on the crystallinity of CG PEC, XRD was conducted. As shown in Figure b, two characteristic crystal peaks of chitosan is located at 2 θ = 11.1° and 20.4°, respectively, agreeing well with the published values . Only a weak and broad band was demonstrated on XRD patterns of gelatin due to its amorphous properties.…”

Section: Resultssupporting

confidence: 87%

“…Therefore, the formation of hydrogen bonding and polyelectrolyte complexation is expected to be improved by the microwave processing. In a reported study, thermal annealing treatment is also found to promote the formation of PEC between CS and GE …”

Section: Resultsmentioning

confidence: 87%

“…Besides, the shift of characteristic band of hydroxyl group, microwave treatment had influence on amide I and II bands. According to our previous studies, the intensity ratio of the amide I II region can act as the indicator to evaluate the degree of polyelectrolyte complexation in CS/GE composites. Generally, the microwave treatment elevated the intensity ratio value slightly in the CG composite nanofiber system.…”

Section: Resultsmentioning

confidence: 99%

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Rapidly and Effectively Improving the Mechanical Properties of Polyelectrolyte Complex Nanofibers through Microwave Treatment

et al. 2016

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A facile method for improving the mechanical properties of polyelectrolyte complex (PEC) nanofibers by microwave treatment is proposed and investigated in chitosan/gelatin (CG) PEC model system. The microwave treatment with 600 W for 120 s produces 1.3-and 2.6-folds elevation on Young's modulus and tensile strength of nanofiber membranes, respectively, which is attributed to the enhanced intermolecular interactions and the increased crystallinity in CG composites. In addition, the microwave-treated CG nanofibers are found still possessing excellent swelling and antibacterial capability, which are indispensable for wound dressing application. Therefore, the microwave treatment can be employed as an effective and rapid strategy to produce PEC nanofibers with ideal mechanical property.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

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Rapidly and Effectively Improving the Mechanical Properties of Polyelectrolyte Complex Nanofibers through Microwave Treatment

et al. 2016

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“…28 Further, the sample in native AAO showed distinctive yellowing following meltpressing, which is suggestive of degradation. Other studies have shown a drift in the thermal transition temperatures of poly(trimethylene malonate) 29 and electrospun chitosan-gelatin nanofibers 30 due to degradation using DSC. The thermal properties of PC infiltrated into silanized AAO templates were compared to that of bulk ( Figure 4 and Figure S2, Supporting Information).…”

mentioning

confidence: 94%

The Effect of Surface Chemistry on the Glass Transition of Polycarbonate Inside Cylindrical Nanopores

Reid¹,

Freire

Lutkenhaus³

2015

ACS Macro Lett.

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The effect of surface chemistry on the glass transition of polycarbonate (PC) inside cylindrical nanopores is studied. Polycarbonate is melt-wetted into nanoporous anodic aluminum oxide (AAO) treated with hydrophobic alkyl-and fluorosilanes of varying length. The curvature observed at the nanowire tips is consistent with a contact angle descriptive of polycarbonate−AAO surface interactions. Differential scanning calorimetry (DSC) thermograms reveal a distinct broadening of the T g that is related to the motion of polymer chains at the nanopore wall as well as at the core. DSC and thermal gravimetric analysis (TGA) show that polycarbonate infiltrated into a naked AAO template (without silane treatment) degrades upon heating, suggestive of a surface-catalyzed degradation mechanism. It is further shown that silane treatment largely prevents PC thermal degradation.T he effect of confinement on the glass transition temperature (T g ) remains a topic of intense discussion. As a polymer film decreases in thickness, the effect of the surface grows in dominance, and the films' properties differ from bulk. The nature of the supporting surface can drastically alter the T g for amorphous polymer thin films. For instance, free-standing poly(styrene) films showed a greater reduction in T g as compared to films deposited on hydrogen-passivated Si(111). 1 Elsewhere, the T g of poly(styrene) thin films decreased or increased depending on whether the supporting surface was repulsive or attractive, respectively. 2 In this work we report the effect of surface chemistry on interactions between polycarbonate (PC) and nanoporous silane-modified anodic aluminum oxide (AAO) templates as well as the resulting changes in the glass transition of the polymer (Figure 1). This configuration is convenient for isolating the effect of surface chemistry because AAO templates are easily modified via silanes and because the infiltrated polymer has negligible free surface. Modification of AAO templates using silane chemistry has been previously demonstrated using both vapor-phase 3−6 and solution approaches. 7−11 PC, popularly used in many industrial applications, is a semicrystalline polymer. The reported melting temperature (T m ) and T g is 220−260°C and 140−151°C, respectively. 12

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“…Among them, poly(L-lactic acid) (PLLA) is one of the most extensively used biopolymers, as it is one of the few bioresorbable polymers that have been approved by the U.S. Food and Drug Administration for in vivo applications. However, electrospun PLLA nanofiber scaffolds normally have weak mechanical strength, partially resulted from high porosity and random alignment of fibers, which limit their biomedical applications, especially as tissue engineering scaffolds [8,9].…”

Section: Introductionmentioning

confidence: 99%

Toughening of electrospun poly(l-lactic acid) nanofiber scaffolds with unidirectionally aligned halloysite nanotubes

et al. 2014

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The mechanical properties of the tissue engineering scaffold are important as they are tightly related the regeneration of structural tissue. The application of poly(L-lactic acid) (PLLA) nanofiber scaffolds in tissue engineering has been hindered by their insufficient mechanical properties. In the study, halloysite nanotubes (HNTs) were used to reinforce the mechanical properties of PLLA-based nanofibers. 4 wt% HNT/PLLA nanofiber membranes possess the best mechanical performance, which represents 61 % increase in tensile strength, 100 % improvement of Young's modulus, 49 % augment of elongation to break, as well as 181 % elevation in energy to break compared with neat PLLA samples. The satisfactory enhancement effect of HNTs can be attributed to the effective dispersion and incorporation of HNTs in PLLA matrix, which have been confirmed by the analysis of SEM, TEM, and FTIR. The addition of HNTs also improves the degree of crystallization and thermal stability of PLLA-based nanofibers. HNT-incorporated PLLA nanofiber membranes possess higher protein adsorption from fetal bovine serum than the neat PLLA specimen. Therefore, the introduction of HNTs can effectively enhance the mechanical properties of PLLA nanofiber scaffolds. HNT/PLLA nanofiber scaffolds possess potential application in skin tissue engineering.

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Effect of thermal annealing on mechanical properties of polyelectrolyte complex nanofiber membranes

Cited by 29 publications

References 33 publications

Rapidly and Effectively Improving the Mechanical Properties of Polyelectrolyte Complex Nanofibers through Microwave Treatment

Rapidly and Effectively Improving the Mechanical Properties of Polyelectrolyte Complex Nanofibers through Microwave Treatment

The Effect of Surface Chemistry on the Glass Transition of Polycarbonate Inside Cylindrical Nanopores

Toughening of electrospun poly(l-lactic acid) nanofiber scaffolds with unidirectionally aligned halloysite nanotubes

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