The role of the ratio (PEG:PPG) of a triblock copolymer (PPG‐b‐PEG‐b‐PPG) in the cure kinetics, miscibility and thermal and mechanical properties in an epoxy matrix
Abstract Here we report the effect of multi-walled carbon nanotubes (MWCNTs) and thermally reduced graphene (TRG) on the miscibility, morphology and final properties of nanostructured epoxy resin with an amphiphilic poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymer. The addition of nanoparticles did not have any influence on the miscibility of PEO-PPO-PEO copolymer in the resin. However, MWCNTs and TRG reduced the degree of crystallinity of the PEO-...
#1Tao Wang(WUT: Wuhan University of Technology)H-Index: 7
#2Jun Wang(WUT: Wuhan University of Technology)H-Index: 4
Last. Jingjun Yang(WUT: Wuhan University of Technology)H-Index: 1
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Poly(butyl acrylate–glycidyl methacrylate) (PBG) was prepared by in situ polymerization of butyl acrylate (BA) and glycidyl methacrylate (GMA) and further used as a modifier to improve the comprehensive properties of the epoxy resin curing system. The modified resin system was based on diglycidyl ether of bisphenol, methyl tetrahydrophthalic anhydride, and tris(dimethylaminomethyl)phenol. The influence of copolymer composition on the mechanical properties, thermal performance, and phase behavior...
Abstract The effects of two diblock copolymers, poly(ethylene- alt -propylene)- b -poly(ethylene oxide) (PEP–PEO) and poly(1,2-butadiene)- b -poly(2-vinyl pyridine) (PB–P2VP) on the mechanical properties of epoxy coatings were studied. Both modifiers self-assembled into spherical micelles of 10–20 nm diameter in cured bulk epoxy. This morphology was preserved in 15 μm thick coatings; however, micelle segregation to the coating/substrate interface was also observed. The critical strain energy rel...
#1Laida Cano(UPV/EHU: University of the Basque Country)H-Index: 7
#2Daniel H. Builes(UPV/EHU: University of the Basque Country)H-Index: 6
Last. Agnieszka Tercjak(UPV/EHU: University of the Basque Country)H-Index: 29
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Abstract Thermosetting systems based on DGEBA epoxy resin and poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) (EPE) triblock copolymer were prepared and investigated. Different mixtures were obtained by using different contents of EPE block copolymer in order to study the influence of the modifier on the properties of the final materials. All thermosetting systems were prepared without using any solvent and were cured at ambient temperature, taking into account the lower critical solutio...
Styrene-block-butadiene-block-styrene (SBS) triblock copolymers epoxidized at several epoxidation degrees by hydrogen peroxide in water/dichloroethane biphasic system were blended with epoxy based on diglycidyl ether of bisphenol A (DGEBA) and DDM (4,4′-diaminodiphenyl methane) as curing agent. The incorporation of epoxidized block copolymers in epoxy resulted in the formation of nanostructured blends. The morphologies of the blended polymers were studied using field emission scanning electron m...
Abstract The present paper considers the mechanical and fracture properties of four different epoxy polymers containing 0, 10 and 20 wt.% of well-dispersed silica nanoparticles. Firstly, it was found that, for any given epoxy polymer, their Young’s modulus steadily increased as the volume fraction, v f, of the silica nanoparticles was increased. Modelling studies showed that the measured moduli of the different silica-nanoparticle filled epoxy polymers lay between upper-bound values set by the H...
Preface . List of Contributors . 1 General Concepts about Epoxy Polymers ( Jean-Pierre Pascault and Roberto J.J. Williams). 1.1 Polymerization Chemistry of Epoxy Monomers . 1.2 Transformations During the Formation of an Epoxy Network . 1.3 General Properties of Epoxy Networks . References . Part One New Polymers/Materials . 2 Thermoplastic Epoxy Polymers ( Jerry E. White). 2.1 Introduction . 2.2 Synthesis and Characterization of Epoxy Thermoplastics . 2.3 Fundamental Properties of Epoxy Thermopl...
Block copolymer modified epoxy resins have generated significant interest since it was demonstrated that the combination could lead to nanostructured thermosets through self-assembly. Over moderate to high polymer concentration the system behaves as expected for a block copolymer in a solvent selective for one block. Two types of copolymers have been studied: non-reactive and reactive modifiers. Morphologies such as copolymer vesicle and spherical/wormlike micelles can be formed under the approp...
Abstract Designing innovative multi-functional thermoset polymers represents a major challenge in materials science. In this work, two novel polyhedral imidazolium ionic liquid supported on oligomeric silsesquioxane nanocages having chloride (Cl−) and bistrifluoromethanesulfonimidate (NTf2-) counter anions have been synthesized. These ionic nano-objects were used to nanostructure a model epoxy network. Hence, networks displaying a homogeneous nanoscale morphology were obtained by introducing 5 w...
The addition of thermoplastic to thermosetting matrix systems has been proposed as a successful strategy to produce polymers with self-healing ability. Curing mechanism of diglycidyl ether of bisphenol A/triethylene-tetramine epoxy system modified with poly(ethylene-co-methacrylic acid) (EMAA) thermoplastic healing agent was investigated in this work. The effects of thermoplastic content, particle size and dispersion on thermomechanical properties were studied. Specimens were produced with 5 wt....
#1Bruna Louise Silva(UDESC: Universidade do Estado de Santa Catarina)H-Index: 2
#2Marcia B. Schuster(UDESC: Universidade do Estado de Santa Catarina)H-Index: 2
Last. Luiz A. F. Coelho(UDESC: Universidade do Estado de Santa Catarina)H-Index: 17
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This work studies the effects of combining triblock copolymers with carbon nanoparticles (carbon nanotubes, graphene and carbon black) on curing kinetics. The chosen triblock copolymer was poly (propylene glycol)-block-poly (ethylene glycol)-block-poly (propylene glycol) (PPG-b-PEG-b-PPG), which has different contents of PEG in its structure. The main objective is to investigate the influence of the miscibility of the PPG-b-PEG-b-PPG copolymer in epoxy nanocomposites. The PEG fraction in the cop...
Abstract Several new classes of polymeric materials are being introduced with unique properties. Thermoresponsive polymers (TRPs) are one of the most fascinating and emerging class of biomaterials in biomedical research. The design of TRPs with good response to temperature and its ability to exhibit coil to globular transition behavior near to physiological temperature made them more promising materials in the field of biomaterials and biomedicines. Instead of numerous studies on TRPs, the mecha...
Abstract Hypothesis PEG-PPG-PEG contains hydrophobic (PPG) as well as hydrophilic (PEG) blocks have gained popularity due to their different physiochemical properties that make them useful in several scientific areas and industrial applications such as detergency, stabilizers for dispersion, foaming and many more. Scientific communities reported that additives have ability to tune the micellization/demicellization tendency of PEG-PPG-PEG which we further extended by the use of several N-containi...
Abstract Simultaneous polymerization of polyacrylic, polyamine, and polyepoxy monomers offers the potential to generate a novel polymer backbone with new and beneficial properties. The Aza-Michael addition of amines to acrylates is fast and exothermic and can thus increase the rate of amine epoxy reactions producing poly amino-ester-alcohol polymer backbones. The polymerization is shown to be remarkably tolerant of organic and aqueous solvent interactions. The resultant polymers are transparent ...
#1Roger H. Bello(UDESC: Universidade do Estado de Santa Catarina)H-Index: 5
#2Luiz A. F. Coelho(UDESC: Universidade do Estado de Santa Catarina)H-Index: 17
Abstract In this work the role of the addition of barium titanate (BaTiO 3 ) or multi-walled carbon nanotubes (MWCNT) on curing kinetics of the polyhexahydro-s-triazine (PHT) was investigated. The estimation of kinetic parameters triplet (activation energy, pre-exponential factor, and the reaction model) of PHT and its nanocomposites were made by isoconversional models. It is possible to state the conversion of the polyhemiaminal (PHA) into PHT polymer and all nanocomposites studied in this work...