Surface wettability and strong adhesion of medical polyurethane elastomer porous films by microphase separation

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.

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CO2-Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion

Advanced Materials Interfaces ◽

10.1002/admi.201500623 ◽

2016 ◽

Vol 3 (7) ◽

pp. 1500623 ◽

Cited By ~ 26

Author(s):

Hongyao Yin ◽

Anne-Laure Bulteau ◽

Yujun Feng ◽

Laurent Billon

Keyword(s):

Cell Adhesion ◽

Surface Wettability ◽

Porous Films

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.152-153.525 ◽

2010 ◽

Vol 152-153 ◽

pp. 525-529

Author(s):

Tao Tao Qiang ◽

Xue Chuan Wang ◽

Xian Bo Lu ◽

Long Fang Ren

Keyword(s):

Mechanical Properties ◽

Microphase Separation ◽

Testing Machine ◽

Film Surface ◽

Dibutyltin Dilaurate ◽

Polyurethane Elastomer ◽

Force Microscopy ◽

Atomic Force ◽

Hyperbranched Poly ◽

Ft Ir

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%.

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Rheological investigation of microphase separation transition of polyurethane elastomer

Journal of Applied Polymer Science ◽

10.1002/app.24641 ◽

2006 ◽

Vol 103 (4) ◽

pp. 2107-2112 ◽

Cited By ~ 2

Author(s):

I-Kuan Yang ◽

Pei Ju Wang ◽

Ping Hung Tsai

Keyword(s):

Microphase Separation ◽

Polyurethane Elastomer

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The Influential Factors of Property on Polyether-Polyol Type Polyurethane Elastomer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.704.289 ◽

2013 ◽

Vol 704 ◽

pp. 289-293 ◽

Cited By ~ 3

Author(s):

Fu Chun Xie ◽

Fu Quan Guo

Keyword(s):

Mechanical Properties ◽

Molecular Weight ◽

Hard Segment ◽

Microphase Separation ◽

Chain Extender ◽

Influential Factors ◽

Polyurethane Elastomer ◽

Elongation At Break ◽

Polyether Polyol ◽

Tear Resistance

Polyurethane (PU) elastomers based on all kinds of polyether-polygol, diisocyanate and chain extender were prepared by two-step processes;the different influential factors of polyurethane elastomer were discussed in detail. The results showed that when the molecular weight of polyether-polygol increased, the hardnesstensile strength and tear resistance of polyurethane elastomer decreased, but the elongation at break increased;the property of polyurethane elastomer increased with the increasing perecentage of hard segment phase;R numerical value (-NCO/-OH) was controlled between 1.01 and 1.03;the shorter chain-extender had excellent microphase separation and mechanical properties;With the amount of 1, 4-butadiene alcohol (BDO) incrasing, the performance of polyurethane elastomer becomes well,but when the amount of 1, 4-butadiene alcohol comes to a point it appears reverse.

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Morphological studies of linear (AB)n multiblock copolymers and their blends

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100122320 ◽

1992 ◽

Vol 50 (1) ◽

pp. 384-385

Author(s):

Richard J. Spontak ◽

Steven D. Smith ◽

Arman Ashraf

Keyword(s):

Electron Microscopy ◽

Microphase Separation ◽

Multiblock Copolymers ◽

First Order ◽

Morphological Studies ◽

Transmission Electron ◽

First Order Phase Transition ◽

Covalently Bonded ◽

Total Molecular Weight ◽

First Order Phase

Block copolymers are composed of sequences of dissimilar chemical moieties covalently bonded together. If the block lengths of each component are sufficiently long and the blocks are thermodynamically incompatible, these materials are capable of undergoing microphase separation, a weak first-order phase transition which results in the formation of an ordered microstructural network. Most efforts designed to elucidate the phase and configurational behavior in these copolymers have focused on the simple AB and ABA designs. Few studies have thus far targeted the perfectly-alternating multiblock (AB)n architecture. In this work, two series of neat (AB)n copolymers have been synthesized from styrene and isoprene monomers at a composition of 50 wt% polystyrene (PS). In Set I, the total molecular weight is held constant while the number of AB block pairs (n) is increased from one to four (which results in shorter blocks). Set II consists of materials in which the block lengths are held constant and n is varied again from one to four (which results in longer chains). Transmission electron microscopy (TEM) has been employed here to investigate the morphologies and phase behavior of these materials and their blends.

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