Preparation and Evaluation of Nanofibrous Hydroxypropyl Cellulose and β-Cyclodextrin Polyurethane Composite Mats

Abstract

A series of nanofibrous composite mats based on polyurethane urea siloxane (PUUS), hydroxypropyl cellulose (HPC) and β-cyclodextrin (β-CD) was prepared using electrospinning technique. PUUS was synthesized by two steps solution polymerization procedure from polytetramethylene ether glycol (PTMEG), dimethylol propionic acid (DMPA), 4,4 -diphenylmethane diisocyanate (MDI) and 1,3-bis-(3-aminopropyl) tetramethyldisiloxane (BATD) as chain extender. Then, the composites were prepared by blending PUUS with HPC or βCD in a ratio of 9:1 (w/w), in 15% dimethylformamide (DMF). The PUUS and PUUS based composite solutions were used for preparation of nanofibrous mats. In order to identify the potential applications, different techniques were used to evaluate the chemical structure (Fourier transform infrared-attenuated total reflectance spectroscopy-FTIR-ATR), morphological structure (Scanning electron microscopy-SEM and Atomic force microscopy-AFM), surface properties (contact angle, dynamic vapors sorption-DVS), mechanical characteristics (tensile tests), thermal (differential scanning calorimetry-DSC) and some preliminary tests for biocompatibility and microbial adhesion.

Composite Materials Based on Iron Oxide Nanoparticles and Polyurethane for Improving the Quality of MRI

“…PU was synthetized using a polymerization solution method based on a previously reported procedure [36,37]. Briefly, in a four-necked glass reaction vessel equipped with a stirrer, a dropping funnel, and an N 2 inlet and outlet, one equivalent quantity of PTHF was dehydrated under vacuum (1-3 mmHg) and temperature (100 • C) for 4 h. Then, the reaction vessel was brought to atmospheric pressure under nitrogen and the temperature was decreased until 80 • C was reached.…”

“…The FTIR spectrum of pristine PU showed typical bands related to the polyurethane structure: at 3326 cm −1 , the absorption peak corresponding to the N-H stretching vibration could be seen; the bands at 2940 and 2854 cm −1 were assigned to the asymmetric and symmetric stretching vibration of the C-H bond in CH 2 groups; at 1731 and 1700 cm −1 , the peaks corresponding to the free and bonded C=O stretching of urethane could be observed; the peak at 1597 cm −1 was due to the C=C stretching vibration of MDI; at 1532 cm −1 , the N-H bending band was visible; the peaks at 1412 and 1310 cm −1 were assigned to the -CH 2 deformation vibration; between 1107 and 1031 cm −1 , the bands corresponding to the C-O-C stretching vibration were observable [13,31,37]. These vibration bands confirmed the formation of a pure polyurethane structure.…”

Hydroxypropyl-β-cyclodextrin-incorporated Pebax composite membrane for improved permselectivity in organic solvent nanofiltration

“…1). 26,27,49–51 Comparatively, after being crosslinked by TDI, the FTIR spectrum of the CHP 0–10 membrane without HP-β-CD (Fig. 1c) exhibited a shift in the tiny peak of Pebax at 1640 cm −1 in Fig.…”

Surface energy evaluation of casting and nanofiber polyurethane films by using different models

“…A 20 cm work distance between the needle and the ground collector and 15 kV of the applied voltage were used for electrospinning. The obtained electrospun PU membrane was washed in distilled water for 24 h and dried in vacuum oven at 40°C for 48 h. The electrospinning procedure was detailed in a previous paper 27 …”

“…The obtained electrospun PU membrane was washed in distilled water for 24 h and dried in vacuum oven at 40 C for 48 h. The electrospinning procedure was detailed in a previous paper. 27 For contact angle determination, rectangular PU samples (40 × 5 mm) were glued to the sample holder so that the surface is as flat as possible. The PU samples were denoted as PU-F for the casting sample and PU-N for electrospun sample.…”