Influence of hydroxyl functionalized hyperbranched polymers on the thermomechanical and morphological properties of epoxy resins

2005 ◽  
Vol 45 (2) ◽  
pp. 225-237 ◽  
Author(s):  
G. Cicala ◽  
A. Recca ◽  
C. Restuccia
Keyword(s):  
Epoxy Resins ◽  
Hyperbranched Polymers ◽  
Morphological Properties

scholarly journals Hyperbranched phosphorus flame retardants: multifunctional additives for epoxy resins

2019 ◽  
Vol 10 (31) ◽  
pp. 4346-4358 ◽  
Author(s):  
Alexander Battig ◽  
Jens C. Markwart ◽  
Frederik R. Wurm ◽  
Bernhard Schartel
Keyword(s):  
Flame Retardancy ◽  
Epoxy Resins ◽  
Flame Retardants ◽  
Hyperbranched Polymers ◽  
Multifunctional Additives

Novel phosphorus-based hyperbranched polymers provide multifunctional flame retardancy to epoxy resins.

scholarly journals Enhancing Toughness and Impact Strength of Epoxy Resins by Using Hyperbranched Polymers

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Hangyu Park ◽  
Youngson Choe
Keyword(s):  
Molecular Weight ◽  
Impact Strength ◽  
Epoxy Resins ◽  
Impact Resistance ◽  
Experimental Studies ◽  
Molecular Size ◽  
Hyperbranched Polymers ◽  
Phase Separations ◽  
Hyperbranched Poly ◽  
The Impact

Toughened epoxy has been widely used in industrial areas such as automotive and electronics. In this study, nanosized hyperbranched polymers (HBPs) as a flexibilizer are synthesized and embedded into epoxy resin to enhance the toughness and flexibility. Two different HBPs, hyperbranched poly(methylacrylate-diethanolamine) (poly(MA-DEA)) and poly(methylacrylate- ethanolamine) (poly(MA-EA)), were prepared and blended with both epoxy and polyetheramine, a curing agent. The molecular size of HBPs was estimated to be 6 ~ 14 nm in diameter. The molecular weight of HBPs ranges from 1500(1.5 K) to 7000(7.0 K) g/mol. In cured epoxy/HBP blends, no phase separations are occurred, indicating that HBPs possess sufficient miscibility with epoxy. The tensile toughness of the blends increased with changing the molecular weight of HBPs without sacrificing tensile strengths. The impact strength of the blends increases stiffly until the loading % of HBPs in the blends reaches 10 wt%. In addition, the experimental studies showed that impact resistance also increased with an increase in molecular weight of HBPs. The obtained impact resistance of the epoxy/HBP blends with 10 wt% was 270% more effective compared to that of cured neat epoxy.

Synthesis of Recyclable Hyperbranched Polymers with High Efficiency of Promoting Degradation of Epoxy Resins

2018 ◽  
Vol 3 (17) ◽  
pp. 4873-4883 ◽  
Author(s):  
Luping Wang ◽  
Sufang Chen ◽  
Juan Cheng ◽  
Wenqiang Guo ◽  
Yimei Wang ◽  
...  
Keyword(s):  
Epoxy Resins ◽  
High Efficiency ◽  
Hyperbranched Polymers

Dendritic hyperbranched polymers as tougheners for epoxy resins

Polymer ◽  
1999 ◽  
Vol 40 (9) ◽  
pp. 2249-2261 ◽  
Author(s):  
Louis Boogh ◽  
Bo Pettersson ◽  
Jan-Anders E. Månson
Keyword(s):  
Epoxy Resins ◽  
Hyperbranched Polymers

The effect of amino-terminated hyperbranched polymers on the impact resistance of epoxy resins

2015 ◽  
Vol 294 (3) ◽  
pp. 607-615 ◽  
Author(s):  
Shuiping Li ◽  
Huajun Zhu ◽  
Tingting Lv ◽  
Qin Lin ◽  
Haijun Hou ◽  
...  
Keyword(s):  
Epoxy Resins ◽  
Impact Resistance ◽  
Hyperbranched Polymers ◽  
The Impact

Thermomechanical and morphological properties of epoxy resins modified with functionalized hyperbranched polyester

2006 ◽  
Vol 46 (11) ◽  
pp. 1502-1511 ◽  
Author(s):  
I. Blanco ◽  
G. Cicala ◽  
C. Lo Faro ◽  
O. Motta ◽  
G. Recca
Keyword(s):  
Epoxy Resins ◽  
Morphological Properties ◽  
Hyperbranched Polyester

Effect of stoichiometric ratios for synthesized epoxy phenolic novolac (EPN) resins on their physicochemical, thermomechanical and morphological properties

2016 ◽  
Vol 45 (4) ◽  
pp. 265-279 ◽  
Author(s):  
Abhishek Das ◽  
Gautam Sarkhel
Keyword(s):  
Epoxy Resin ◽  
Epoxy Resins ◽  
Phenol Formaldehyde ◽  
Protective Coatings ◽  
Stoichiometric Composition ◽  
Morphological Properties ◽  
Mechanical And Thermal Properties ◽  
Content Type ◽  
Structural Applications ◽  
Stoichiometric Ratios

Purpose The purpose of this paper is to study the effect of various stoichiometric ratios for synthesised epoxy phenolic novolac (EPN) resins on their physicochemical, thermomechanical and morphological properties. Design/methodology/approach In the present study, EPN (EPN-1, EPN-2, EPN-3, EPN-4 and EPN-5) resins were synthesised by varying five types of different stoichiometric ratios for phenol/formaldehyde along with the corresponding molar ratios for novolac/epichlorohydrin. Their different physicochemical properties of interest, thermomechanical properties as well as morphological properties were studied by means of cured samples with the variation of its stoichiometric ratios. Findings The average functionality and reactivity of EPN resin can be controlled by controlling epoxy equivalence as well as cross-linking density upon its curing as all of these factors are internally correlated with each other. Research limitations/implications Epoxy resins are characterised by a three-membered ring known as the epoxy or oxirane group. The capability of the epoxy ring to react with a variety of substrates imparts versatility to the resin. However, these resins have a major drawback of low toughness, and they are also very brittle, which limits their application in products that require high impact and fracture strength. Practical implications Epoxy resins have been widely used as high-performance adhesives and matrix resins for composites because of their outstanding mechanical and thermal properties. Because of their highly cross-linked structure, the epoxy resin disables segmental movement, making them hard, and it is also notch sensitive, having very low fracture energy. Social implications Epoxy resin is widely used in industry as protective coatings and for structural applications, such as laminates and composites, tooling, moulding, casting, bonding and adhesives. Originality/value Systematic study has been done for the first time, as no exact quantitative stoichiometric data for the synthesis of EPN resin were available on the changes of its different properties. Thus, an optimised stoichiometric composition for the synthesis of the EPN resin was found.

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