Synthesis and Properties of a Bio-Based Epoxy Resin with High Epoxy Value and Low Viscosity

ChemSusChem ◽  
2013 ◽  
Vol 7 (2) ◽  
pp. 555-562 ◽  
Author(s):  
Songqi Ma ◽  
Xiaoqing Liu ◽  
Libo Fan ◽  
Yanhua Jiang ◽  
Lijun Cao ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Low Viscosity ◽  
Epoxy Value

scholarly journals An Effective Method for Preparation of Liquid Phosphoric Anhydride and Its Application in Flame Retardant Epoxy Resin

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2205
Author(s):  
Qian Li ◽  
Yujie Li ◽  
Yifan Chen ◽  
Qiang Wu ◽  
Siqun Wang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Oxygen Index ◽  
Decomposition Temperature ◽  
Ease Of Use ◽  
Limiting Oxygen Index ◽  
Good Thermal Stability ◽  
Low Viscosity ◽  
The Impact

A novel liquid phosphorous-containing flame retardant anhydride (LPFA) with low viscosity was synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and methyl tetrahydrophthalic anhydride (MeTHPA) and further cured with bisphenol-A epoxy resin E-51 for the preparation of the flame retardant epoxy resins. Both Fourier transform infrared spectroscopy (FT-IR), mass spectrometry (MS) and nuclear magnetic resonance (NMR) measurements revealed the successful incorporation of DOPO on the molecular chains of MeTHPA through chemical reaction. The oxygen index analysis showed that the LPFA-cured epoxy resin exhibited excellent flame retardant performance, and the corresponding limiting oxygen index (LOI) value could reach 31.2%. The UL-94V-0 rating was achieved for the flame retardant epoxy resin with the phosphorus content of 2.7%. With the addition of LPFA, the impact strength of the cured epoxy resins remained almost unchanged, but the flexural strength gradually increased. Meanwhile, all the epoxy resins showed good thermal stability. The glass transition temperature (Tg) and thermal decomposition temperature (Td) of epoxy resin cured by LPFA decreased slightly compared with that of MeTHPA-cured epoxy resin. Based on such excellent flame retardancy, low viscosity at room temperature and ease of use, LPFA showed potential as an appropriate curing agent in the field of electrical insulation materials.

Characterization of carbon nanotube 3D-structures infused with low viscosity epoxy resin system

2010 ◽  
Vol 92 (9) ◽  
pp. 2252-2257 ◽  
Author(s):  
Celeste M.C. Pereira ◽  
Paulo Nóvoa ◽  
Marta Martins ◽  
Stefan Forero ◽  
Felicitas Hepp ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Epoxy Resin ◽  
Resin System ◽  
3D Structures ◽  
Low Viscosity ◽  
Epoxy Resin System

Rheological behaviors and processing windows of low viscosity epoxy resin for VIMP

2011 ◽  
Vol 26 (5) ◽  
pp. 931-934 ◽  
Author(s):  
Zhuofeng Liu ◽  
Jingcheng Zeng ◽  
Jiayu Xiao ◽  
Dazhi Jiang ◽  
Chaoyi Peng
Keyword(s):  
Epoxy Resin ◽  
Rheological Behaviors ◽  
Low Viscosity

Synthesis of Liquid Crystalline Epoxy Resin p-BDEPB and Cure Kinetics with 3-MeTHPA

2010 ◽  
Vol 428-429 ◽  
pp. 71-74 ◽  
Author(s):  
Jun Gang Gao ◽  
Cai Yun Zhang ◽  
Li Huo ◽  
Yuan Yuan Zhang
Keyword(s):  
Epoxy Resin ◽  
Liquid Crystalline ◽  
Allyl Bromide ◽  
Cure Kinetics ◽  
Curing Temperature ◽  
Gel Point ◽  
Liquid Crystalline Epoxy ◽  
Clearing Point ◽  
Reaction Orders ◽  
Epoxy Value

A liquid crystalline epoxy resin of p-biphenylene di-4-(2,3-epoxypropyloxy)benzoate (p-BDEPB) was synthesized from allyl bromide, 4-hydroxy ethyl benzoate and 4,4-dihydroxybiphenyl. Its structure and liquid crystalline behavior were characterized by DSC, 1H-NMR, FTIR, POM and XRD. The results are shown that this compound is smectic liquid crystalline.The melting point of p-BDEPB is 210 oC and clearing point is over 300 oC, the epoxy value is 0.312 mol/100g. The average curing Ea of p-BDEPB/3-methyl-tetrahydrophthalic anhydride (MeTHPA) system is 97.2kJ/mol. The gel point of cured-system Tgel is 89.0 oC, curing temperature Tcu is 132.5 oC and finishing temperature Tf is 146.5 oC. The curing reaction can be described by the autocatalytic Šesták-Berggren (S-B) equation, the two reaction orders m and n is 0.23 and 0.74, respectively.

Synthesis of Lignin-Based Epoxy Resin in Ionic Liquid [BMIm]Cl

2015 ◽  
Vol 740 ◽  
pp. 51-54
Author(s):  
Wen Ting Li ◽  
Ming Qiang Chen ◽  
Zhong Lian Yang
Keyword(s):  
Ionic Liquid ◽  
Epoxy Resin ◽  
Synthesis Temperature ◽  
Raw Material ◽  
Value Analysis ◽  
Alkali Lignin ◽  
Optimum Synthesis ◽  
Ft Ir ◽  
Modified Lignin ◽  
Epoxy Value

Industrial alkali lignin (LG) was used as raw material and ionic liquid 1-butyl 3-methylimidazolium chloride ([BMIm]Cl) was used as solvent. Alkali lignin was dissolved into the [BMIm]Cl and modified as propyl ether lignin(HLG). Then the HLG modified lignin was used to synthesizing the lignin-based epoxy resin (LGEP) with epoxy chloropropane. The structure of LG, HLG and LGEP were characterized with FT-IR, the results indicated that the propyl group was introduced to the LG and the reaction activity was improved. The expoxy value analysis results showed that the optimum synthesis temperature was 80°C and the epoxy value was 0.218.

Resins Materials as Alternative Insert for the Fabrication of Micro Structured Surfaces by Micro Injection Moulding

2014 ◽  
Vol 611-612 ◽  
pp. 909-914 ◽  
Author(s):  
Marco Sorgato ◽  
Gioia della Giustina ◽  
Erika Zanchetta ◽  
Giovanna Brusatin ◽  
Giovanni Lucchetta
Keyword(s):  
Epoxy Resin ◽  
Injection Moulding ◽  
High Volume ◽  
Mould Insert ◽  
Structured Surfaces ◽  
Low Viscosity ◽  
Micro Injection Moulding ◽  
High Volume Production ◽  
Resin Precursors ◽  
Micro Mixer

Micro injection moulding is a key technology for mass-production of micro structured surfaces, such as optical and microfluidic devices. The manufacturing of a microstructured master mould with traditional technologies poses challenges about durability, accuracy and high - volume production. This paper introduces a new approach to realize micro mould inserts in a fast and economical way. Suitable engineered materials as alternative inserts to the metallic one are proposed exploiting the following new strategy: a thermosetting epoxy resin from renewable sources was synthesized and used to realize the mould insert via casting. The initial low viscosity of the liquid epoxy resin precursors allows the achievement of a high fidelity replica of different micro structures and provides an inexpensive and convenient route for rapidly duplicate master mould. A staggered harringbone (SHM) micro-mixer geometry was replicated and the epoxy based resin insert withstood 900 moulding cycles showing good features replication and durability.

scholarly journals A Simplified Method for Formulation of Epoxy Resin Embedding Media

2006 ◽  
Vol 14 (5) ◽  
pp. 50-51 ◽  
Author(s):  
E. Ann Ellis
Keyword(s):  
Molecular Weight ◽  
Epoxy Resin ◽  
Molar Ratio ◽  
Molecular Weights ◽  
Molar Ratios ◽  
Low Viscosity ◽  
Simplified Method ◽  
Beam Stability ◽  
Embedding Medium

In a recent paper on the revised formulation of Spurr low viscosity embedding medium with ERL 4221 the importance of maintaining an appropriate anhydride:epoxide (A:E) ratio was discussed. By understanding a few simple concepts about epoxy resin formulations and setting up a formulation table it is possible to create new resin mixtures with good sectioning properties and other desirable properties such as decreased viscosity and increased beam stability.Before starting a formulation you need to know the molecular weight of the anhydride and the WPE (weight per epoxide equivalent) of the epoxy resin component. The molecular weights and WPEs are usually printed on the bottle or can be obtained from the vendor. An A:E ratio of 0.7:1.0 -1.0:1.0 is used for most biological specimens. Increasing the A:E ratio results in a harder block; decreasing the A:E ratio results in a softer block. Table 1 shows a basic formulation spreadsheet where the molecular weights of the anhydrides and the WPEs of the epoxy resin components can be entered. The A:E ratio is entered under the anhydride for the molar ratio and the molar ratios of the epoxy components are entered under the epoxy components. The calculations are done as shown in each column and row.

Structure and properties of a low viscosity acrylate based flexible epoxy resin

2015 ◽  
Vol 133 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yuan Yang ◽  
Yun-Feng Zhao ◽  
Jian-Yue Wang ◽  
Chuan Zhao ◽  
Liu Tong ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Structure And Properties ◽  
Low Viscosity
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