Synthesis of Polyurethane Hydrogel and Polyurethane Thermoplastic Elastomer Composite Based Separation Membranes

ABSTRACT Thiol-ene modification of high vinyl content thermoplastic elastomeric styrene butadiene styrene (SBS) block copolymer (BCP) was carried out using different thiolating agents in toluene at 70 °C. 1H NMR analysis confirmed the participation of vinyl double bond in the thiol-ene modification reaction of SBS. Surface morphology of the block copolymers evaluated by atomic force microscopy analysis showed higher roughness after the thiol-ene reaction. The thiol-modified SBS block copolymer showed better adhesion strength and oil resistance properties than the pristine SBS.

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An octahedral stress-based fracture criterion for hyperelastic materials

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406220972136 ◽

2020 ◽

pp. 095440622097213

Author(s):

A Hamdi ◽

A Boulenouar ◽

N Benseddiq

Keyword(s):

Pure Shear ◽

Thermoplastic Elastomer ◽

Styrene Butadiene Rubber ◽

Butadiene Rubber ◽

Principal Stresses ◽

Hyperelastic Materials ◽

Biaxial Tests ◽

Set Up ◽

Loading Modes ◽

Styrene Butadiene

No uniﬁed stress-based criterion exists, in the literature, for predicting the rupture of hyperelastic materials subjected to mutiaxial loading paths. This paper aims to establish a generalized rupture criterion under plane stress loading for elastomers. First, the experimental set up, at breaking, including various loading modes, is briefly described and commented. It consists of uniaxial tests, biaxial tests and pure shear tests, performed on different rubbers. The used vulcanizate and thermoplastic rubber materials are a Natural Rubber (NR), a Styrene Butadiene Rubber (SBR), a Polyurethane (PU) and a Thermoplastic elastomer (TPE). Then, we have investigated a new theoretical approach, based upon the principal stresses, to establish a failure criterion under quasi-static loadings. Thus, we have proposed a new analytical model expressed as a function of octahedral stresses. Quite good agreement is highlighted when comparing the ultimate stresses, at break, between the experimental data and the prediction of the proposed criteria using our rubber-like materials.

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Tailoring the properties of PA6 into high-performance thermoplastic elastomer: Simultaneous reinforcement and impact property modification

Materials Today Communications ◽

10.1016/j.mtcomm.2021.102027 ◽

2021 ◽

Vol 26 ◽

pp. 102027

Author(s):

Elnaz Esmizadeh ◽

Ali Vahidifar ◽

Sahar Shojaie ◽

Ghasem Naderi ◽

Mohammad Reza Kalaei ◽

...

Keyword(s):

High Performance ◽

Thermoplastic Elastomer ◽

Impact Property ◽

Property Modification

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Three-dimensional macroporous wood-based selective separation membranes decorated with well-designed Nd(III)-imprinted domains: A high-efficiency recovery system for rare earth element

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2020.11.030 ◽

2020 ◽

Author(s):

Yilin Wu ◽

Rongxin Lin ◽

Faguang Ma ◽

Wendong Xing ◽

Jianming Pan

Keyword(s):

Rare Earth ◽

Rare Earth Element ◽

Earth Element ◽

High Efficiency ◽

Three Dimensional ◽

Selective Separation ◽

Separation Membranes ◽

Recovery System

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Mitigating the Agglomeration of Nanofiller in a Mixed Matrix Membrane by Incorporating an Interface Agent

Membranes ◽

10.3390/membranes11050328 ◽

2021 ◽

Vol 11 (5) ◽

pp. 328

Author(s):

Manh-Tuan Vu ◽

Gloria M. Monsalve-Bravo ◽

Rijia Lin ◽

Mengran Li ◽

Suresh K. Bhatia ◽

...

Keyword(s):

Gas Separation ◽

Polymer Matrix ◽

Ion Beam ◽

High Surface ◽

Mixed Matrix Membrane ◽

Mechanical And Thermal Properties ◽

Separation Membranes ◽

Surface Areas ◽

Separation Membrane ◽

Focus Ion Beam

Nanodiamonds (ND) have recently emerged as excellent candidates for various applications including membrane technology due to their nanoscale size, non-toxic nature, excellent mechanical and thermal properties, high surface areas and tuneable surface structures with functional groups. However, their non-porous structure and strong tendency to aggregate are hindering their potential in gas separation membrane applications. To overcome those issues, this study proposes an efficient approach by decorating the ND surface with polyethyleneimine (PEI) before embedding it into the polymer matrix to fabricate MMMs for CO2/N2 separation. Acting as both interfacial binder and gas carrier agent, the PEI layer enhances the polymer/filler interfacial interaction, minimising the agglomeration of ND in the polymer matrix, which is evidenced by the focus ion beam scanning electron microscopy (FIB-SEM). The incorporation of PEI into the membrane matrix effectively improves the CO2/N2 selectivity compared to the pristine polymer membranes. The improvement in CO2/N2 selectivity is also modelled by calculating the interfacial permeabilities with the Felske model using the gas permeabilities in the MMM. This study proposes a simple and effective modification method to address both the interface and gas selectivity in the application of nanoscale and non-porous fillers in gas separation membranes.

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