Synthesis, Characterization and Mechanical Properties of Hydroxyl-Terminated Hyperbranched Polymer Graft Polyether-Based Aliphatic Polyurethane Elastomer

Hydroxyl-terminated hyperbranched polyurethane elastomer (HBPU) was synthesized by graft copolymerization of hyperbranched poly (amine-ester) polyols(HPAE) and polyether-based aliphatic polyurethane prepolymer(PPU), and the PPU was synthesized by step polymerization of isophorone diisocyanate(IPDI) with polyethylene glycol(PEG) and dibutyltin dilaurate(DBTDL) as catalyst. The FT-IR spectroscopy, TGA and XRD were used to characterize the structure, thermal properties and crystallinity of HBPU. The mechanical properties of the elastomers were conducted on a testing machine. Microphase separation of HBPU film surface was studied by atomic force microscopy (AFM). The experimental results showed that the HBPU took on excellent hydrogen bonding and mechanical properties. The tensile strength of HBPU elastomer reached to 20.6MPa, which increased by 41.2 times than that of PPU elastomer. And the elongation at break was as high as 251.3%.

Download Full-text

Influence of Polyol/Crosslinker Blend Composition on Phase Separation and Thermo-Mechanical Properties of Polyurethane Thin Films

Polymers ◽

10.3390/polym12030666 ◽

2020 ◽

Vol 12 (3) ◽

pp. 666 ◽

Cited By ~ 3

Author(s):

Said Arévalo-Alquichire ◽

Maria Morales-Gonzalez ◽

Kelly Navas-Gómez ◽

Luis E. Diaz ◽

José A. Gómez-Tejedor ◽

...

Keyword(s):

Mechanical Properties ◽

Phase Separation ◽

Loss Factor ◽

Microphase Separation ◽

Mechanical Analysis ◽

Damping Capacity ◽

Force Microscopy ◽

X Ray Scattering ◽

Atomic Force ◽

Hard Segments

Polyurethanes (PUs) from Polyethylene glycol (PEG) and polycaprolactone diol (PCL) and a crosslinker, Pentaerythritol (PE), were synthetized with isophorone diisocyanate (IPDI). In this study, we investigated the effect of polyol and crosslinker composition on phase separation and thermo-mechanical properties. The properties were studied through dynamic mechanical analysis, X-ray scattering, atomic force microscopy (AFM), and thermogravimetric analysis (TGA). The results showed changes in PUs properties, microphase structure, and separation due to the composition of polyol/crosslinker blend. So, the largest concentration of PE produced multimodal loss factor patterns, indicating segment segregation while PUs with a PEG/PCL = 1 displayed a monomodal loss factor pattern, indicating a homogeneously distributed microphase separation. Additionally, the increase of the PEG concentration enhanced the damping capacity. On the other hand, agglomeration and thread-like structures of hard segments (HS) were observed through AFM. Finally, the thermal behavior of PUs was affected by chemical composition. Lower concentration of PE reduced the crosslinking; hence, the temperature with the maximum degradation rate.

Download Full-text

Preparation and Self-Assembling of PLA-b-PNIPAM-b-PS Triblock Copolymer Thin Films

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19072 ◽

2021 ◽

Vol 21 (4) ◽

pp. 2174-2184

Author(s):

Diansen Zhang ◽

Yuzheng Xia ◽

Hongliang Gong ◽

Dong Zhang ◽

Xiaonong Chen ◽

...

Keyword(s):

Microphase Separation ◽

Film Surface ◽

Chemical Compositions ◽

Stimuli Responsive ◽

Porous Films ◽

Force Microscopy ◽

Self Assembling ◽

Atomic Force ◽

Reversible Addition ◽

Self Assembled

Polylactide-b-poly(N-isopropylacrylamide)-b-polystyrene (PLA-b-PNIPAM-b-PS) triblock copolymers (tri-BCPs) with various chemical compositions (block ratio) were prepared from the combination of ring-opening polymerization and reversible addition-fragmentation chain transfer polymerization. Subsequently, the self-assembling behaviors of these tri-BCP films obtained from spin-coating were investigated by annealing them under different solvent atmosphere. We found that these films could self-assemble into various morphologies due to the microphase separation of incompatible copolymer blocks. Atomic force microscopy confirmed the perpendicular cylindrical morphology self-assembled from PLA4.5k-b-PNIPAM5.2k-b-PS22.4k tri-BCP film under mixed solvent atmosphere of toluene/acetone (7:3, v/v). Self-assembled PLA cylinders are evenly distributed among the PS matrix and perpendicular to the film surface, with PNIPAM component taking place at the PLA/PS interphase. Furthermore, by etching the degradable PLA component, porous PS film decorated with PNIPAM “brushes” hoisting channels were generated. This work provides a facile method and detailed protocol for fabricating stimuli-responsive porous films which are promising for thermoresponsive “smart” separation technologies.

Download Full-text

Preparation and Application Properties Analysis of Hyperbranched Polyurethane Leather Finishing Agent

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.129-131.251 ◽

2010 ◽

Vol 129-131 ◽

pp. 251-255

Author(s):

Xue Chuan Wang ◽

Xian Bo Lu ◽

Tao Tao Qiang ◽

Long Fang Ren

Keyword(s):

Microphase Separation ◽

Film Surface ◽

Water Vapor Permeability ◽

Physical And Mechanical Properties ◽

Dibutyltin Dilaurate ◽

Vapor Permeability ◽

Hyperbranched Poly ◽

Hyperbranched Polyurethane ◽

Finishing Agent ◽

Leather Finishing

A novel hyperbranched polyurethane (HBPU) finishing agent was prepared by graft copolymerization of hyperbranched poly (amine-ester) polyols (HPAE) and the isocyanate-terminated polyurethane prepolymer(PPU). The PPU was synthesized by step polymerization of isophorone diisocyanate (IPDI) with polyethylene glycol (PEG) and dibutyltin dilaurate (DBTDL) as catalyst. The FT-IR spectroscopy was used for the structural characterization. The thermal properties of HBPU were characterized by TGA. Microphase separation of HBPU film surface was studied by tapping-mode atomic force microscopy (AFM). Moreover, in contrast to 200-UT, the physical and mechanical properties of HBPU as finishing agent were investigated: curing time was decreased by 26.15% and the water vapor permeability was increased by 9.04%.

Download Full-text

Molecular force transfer mechanisms in graphene oxide paper evaluated using atomic force microscopy and in situ synchrotron micro FT-IR spectroscopy

Nanoscale ◽

10.1039/c4nr03646h ◽

2014 ◽

Vol 6 (23) ◽

pp. 14404-14411 ◽

Cited By ~ 12

Author(s):

Congwei Wang ◽

Mark D. Frogley ◽

Gianfelice Cinque ◽

Lu-Qi Liu ◽

Asa H. Barber

Keyword(s):

Mechanical Properties ◽

Graphene Oxide ◽

Force Microscopy ◽

Atomic Force ◽

Molecular Force ◽

Force Transfer ◽

Ft Ir ◽

Graphene Oxide Paper ◽

Ft Ir Spectroscopy

The mechanical properties of graphene oxide (GO) paper are critically defined both by the mechanical properties of the constituent GO sheets and the interaction between these sheets.

Download Full-text

Sodium Alginate-Zinc Oxide Nanocomposite Film for Antibacterial Wound Healing Applications

Biointerface Research in Applied Chemistry ◽

10.33263/briac105.62456252 ◽

2020 ◽

Vol 10 (5) ◽

pp. 6245-6252

Keyword(s):

Wound Healing ◽

Zinc Oxide ◽

Sodium Alginate ◽

Zno Nanoparticles ◽

Film Surface ◽

Antibacterial Activities ◽

Zno Nanoparticle ◽

Force Microscopy ◽

Atomic Force ◽

Ft Ir

This study aims to develop sodium alginate (SA) based ZnO nanoparticles as antibacterial film for wound healing applications. As natural materials, sodium alginate has been widely investigated and used in wound healing. The ZnO nanoparticles were incorporated as antibacterial into sodium alginate with different compositions (2, 4, 6, 8, 10 ml). Solvent casting method was performed to prepare a film. The film was characterized by using Fourier Transform Infrared Spectroscopy (FT-IR), Atomic Force Microscopy (AFM) and Field Emission Scanning Electron Microscopy (FESEM). Effectiveness of antibacterial activity was carried out against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) to characterize the sample. The results from microstructure analysis indicated that as ZnO nanoparticle compositions increased, the film surface became rough. It was found that sodium alginate incorporated with ZnO had slightly higher antibacterial activities against S. aureus than E. coli. Thus, sodium alginate (SA)-Zinc oxide (ZnO) nanoparticle has the potential to be used as a wound healing material in biomedical applications.

Download Full-text

Mechanical Properties of Membrane Surface of Cultured Astrocyte Revealed by Atomic Force Microscopy

Japanese Journal of Applied Physics ◽

10.1143/jjap.39.3711 ◽

2000 ◽

Vol 39 (Part 1, No. 6B) ◽

pp. 3711-3716 ◽

Cited By ~ 15

Author(s):

Hatsuki Shiga ◽

Yukako Yamane ◽

Etsuro Ito ◽

Kazuhiro Abe ◽

Kazushige Kawabata ◽

...

Keyword(s):

Mechanical Properties ◽

Atomic Force Microscopy ◽

Membrane Surface ◽

Force Microscopy ◽

Atomic Force

Download Full-text

Corrosion Behavior and Mechanical Properties of a Nanocomposite Superhydrophobic Coating

Coatings ◽

10.3390/coatings11060652 ◽

2021 ◽

Vol 11 (6) ◽

pp. 652

Author(s):

Divine Sebastian ◽

Chun-Wei Yao ◽

Lutfun Nipa ◽

Ian Lian ◽

Gary Twu

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Scanning Electron Microscopy ◽

Atomic Force Microscopy ◽

Nanocomposite Coating ◽

Superhydrophobic Coating ◽

Force Microscopy ◽

Atomic Force ◽

Microscopy Images ◽

Scanning Electron

In this work, a mechanically durable anticorrosion superhydrophobic coating is developed using a nanocomposite coating solution composed of silica nanoparticles and epoxy resin. The nanocomposite coating developed was tested for its superhydrophobic behavior using goniometry; surface morphology using scanning electron microscopy and atomic force microscopy; elemental composition using energy dispersive X-ray spectroscopy; corrosion resistance using atomic force microscopy; and potentiodynamic polarization measurements. The nanocomposite coating possesses hierarchical micro/nanostructures, according to the scanning electron microscopy images, and the presence of such structures was further confirmed by the atomic force microscopy images. The developed nanocomposite coating was found to be highly superhydrophobic as well as corrosion resistant, according to the results from static contact angle measurement and potentiodynamic polarization measurement, respectively. The abrasion resistance and mechanical durability of the nanocomposite coating were studied by abrasion tests, and the mechanical properties such as reduced modulus and Berkovich hardness were evaluated with the aid of nanoindentation tests.

Download Full-text

The Infuence of Salicin on Rheological and Film-Forming Properties of Collagen

Molecules ◽

10.3390/molecules26061661 ◽

2021 ◽

Vol 26 (6) ◽

pp. 1661

Author(s):

Katarzyna Adamiak ◽

Katarzyna Lewandowska ◽

Alina Sionkowska

Keyword(s):

Mechanical Properties ◽

Atomic Force Microscopy ◽

Infrared Spectroscopy ◽

Rheological Properties ◽

Silver Carp ◽

Shear Tests ◽

Force Microscopy ◽

Atomic Force ◽

Film Forming ◽

Potential Applications

Collagen films are widely used as adhesives in medicine and cosmetology. However, its properties require modification. In this work, the influence of salicin on the properties of collagen solution and films was studied. Collagen was extracted from silver carp skin. The rheological properties of collagen solutions with and without salicin were characterized by steady shear tests. Thin collagen films were prepared by solvent evaporation. The structure of films was researched using infrared spectroscopy. The surface properties of films were investigated using Atomic Force Microscopy (AFM). Mechanical properties were measured as well. It was found that the addition of salicin modified the roughness of collagen films and their mechanical and rheological properties. The above-mentioned parameters are very important in potential applications of collagen films containing salicin.

Download Full-text

Preparation, Thermal, and Thermo-Mechanical Characterization of Polymeric Blends Based on Di(meth)acrylate Monomers

Polymers ◽

10.3390/polym13060878 ◽

2021 ◽

Vol 13 (6) ◽

pp. 878

Author(s):

Krystyna Wnuczek ◽

Andrzej Puszka ◽

Łukasz Klapiszewski ◽

Beata Podkościelna

Keyword(s):

Mechanical Analysis ◽

Attenuated Total Reflection ◽

Scanning Calorimetry ◽

Force Microscopy ◽

Chemical Structures ◽

Atomic Force ◽

Polymeric Blends ◽

Ft Ir ◽

Acrylate Monomers ◽

Synthesized Materials

This study presents the preparation and the thermo-mechanical characteristics of polymeric blends based on di(meth)acrylates monomers. Bisphenol A glycerolate diacrylate (BPA.GDA) or ethylene glycol dimethacrylate (EGDMA) were used as crosslinking monomers. Methyl methacrylate (MMA) was used as an active solvent in both copolymerization approaches. Commercial polycarbonate (PC) was used as a modifying soluble additive. The preparation of blends and method of polymerization by using UV initiator (Irqacure® 651) was proposed. Two parallel sets of MMA-based materials were obtained. The first included more harmless linear hydrocarbons (EGDMA + MMA), whereas the second included the usually used aromatic copolymers (BPA.GDA + MMA). The influence of different amounts of PC on the physicochemical properties was discussed in detail. Chemical structures of the copolymers were confirmed by attenuated total reflection–Fourier transform infrared (ATR/FT-IR) spectroscopy. Thermo-mechanical properties of the synthesized materials were investigated by means of differential scanning calorimetry (DSC), thermogravimetric (TG/DTG) analyses, and dynamic mechanical analysis (DMA). The hardness of the obtained materials was also tested. In order to evaluate the surface of the materials, their images were obtained with the use of atomic force microscopy (AFM).

Download Full-text