Ultra-robust, self-healable and recyclable polyurethane elastomer via a combination of hydrogen bonds, dynamic chemistry, and microphase separation

2022 ◽  
Vol 23 ◽  
pp. 100708
Author(s):  
J. Xie ◽  
L. Fan ◽  
D. Yao ◽  
F. Su ◽  
Z. Mu ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Microphase Separation ◽  
Polyurethane Elastomer

Molecular dynamics simulation insight into the temperature dependence and healing mechanism of an intrinsic self-healing polyurethane elastomer

2020 ◽  
Vol 22 (31) ◽  
pp. 17620-17631
Author(s):  
Xianling Chen ◽  
Jing Zhu ◽  
Yanlong Luo ◽  
Jun Chen ◽  
Xiaofeng Ma ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Hydrogen Bonds ◽  
Molecular Diffusion ◽  
Healing Process ◽  
The Self ◽  
Dynamics Simulation ◽  
Polyurethane Elastomer ◽  
Self Healing ◽  
Insight Into

The changes in the type and number of hydrogen bonds as well as the microscopic behavior of molecular diffusion in the self-healing process of polyurethane are revealed.

A colorless, transparent and self-healing polyurethane elastomer modulated by dynamic disulfide and hydrogen bonds

2020 ◽  
Vol 44 (15) ◽  
pp. 5746-5754 ◽  
Author(s):  
Xue Wang ◽  
Huijuan Zhang ◽  
Biao Yang ◽  
Liguo Wang ◽  
Hui Sun
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Polyurethane Elastomer ◽  
Self Healing ◽  
High Transparency

A self-healing PU elastomer modulated by disulfide and hydrogen bonding with high transparency of 97% was reported.

Hydrogen Bonds and FTIR Peaks of Polyether Polyurethane-Urea

2019 ◽  
Vol 815 ◽  
pp. 151-156
Author(s):  
Xu Zhao ◽  
Yu Hong Qi ◽  
Ke Jiao Li ◽  
Zhan Ping Zhang
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Steric Effect ◽  
Electronic Effect ◽  
Theoretical Foundation ◽  
Microphase Separation ◽  
Ether Linkage ◽  
Proton Donors ◽  
Hard Segments ◽  
Degree Of Order

Various types of hydrogen bonds exist in polyether polyurethane, polyurethane-urea and polyurea (PUA) and can cause microphase separation. The morphology, properties and applications of polyether PUA are determined by the microphase separation. All kinds of hydrogen bonds make it difficult to assignments of Fourier transform infrared spectroscopy (FTIR) peaks of ether linkage, amine and carbonyl group. This affects the calculation of the hydrogen bonding degree of the hard segments for estimating the degree of microphase separation. This paper summarized hydrogen bonding structures between proton donors and proton acceptors. By analyzing the influence of electronic effect, steric effect, various types of hydrogen bonds and the degree of order of hydrogen bonding on infrared peaks, the relationships between hydrogen bonding structures and infrared peaks are established. Lay the theoretical foundation for evaluating the degree of microphase separation by FTIR method.

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

AIP Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 075309 ◽  
Author(s):  
Mingshan Xue ◽  
Yuwei Ji ◽  
Junfei Ou ◽  
Fajun Wang ◽  
Changquan Li ◽  
...  
Keyword(s):  
Microphase Separation ◽  
Surface Wettability ◽  
Polyurethane Elastomer ◽  
Porous Films ◽  
Strong Adhesion

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

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%.

Rheological investigation of microphase separation transition of polyurethane elastomer

2006 ◽  
Vol 103 (4) ◽  
pp. 2107-2112 ◽  
Author(s):  
I-Kuan Yang ◽  
Pei Ju Wang ◽  
Ping Hung Tsai
Keyword(s):  
Microphase Separation ◽  
Polyurethane Elastomer

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

2013 ◽  
Vol 704 ◽  
pp. 289-293 ◽  
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.

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

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.

Sign in / Sign up

Export Citation Format

Share Document