Back to Search
Start Over
The precise effect of degree of branching of epoxy-ended hyperbranched polymers on intrinsic property and performance.
- Source :
-
Progress in Organic Coatings . Feb2019, Vol. 127, p157-167. 11p. - Publication Year :
- 2019
-
Abstract
- Graphical abstract Highlights • Hyperbranched epoxy resins with a controlled degree of branching (NPEHP-n) were synthesized. • The particle sizes, rheological properties, mechanical and thermal properties of NPEHP-n/DGEBA were studied. • Excellent flowability and disentangling function of NPEHP-n on DGEBA were reported. • The paper will supply an available route to obtain low viscosity and solvent-free epoxy resins. Abstract Epoxy-ended hyperbranched polymers (EHPs) are increasingly used in toughening and reinforcing diglycidyl ether of bisphenol-A (DGEBA). Synthesis of EHPs with a precise degree of branching (DB) and the effect of DB on the property of EHPs are still a challenge. Here we report the synthesis and properties of nitrogen-phosphor skeleton epoxy-ended hyperbranched polymers (NPEHP-n) with a controlled degree of branching. The particle sizes, rheological properties, mechanical and thermal properties of NPEHP-n/DGEBA composites were studied in detail and compared with those of pure DGEBA. The particle sizes, viscosities, storage modulus and loss modulus of NPEHP-n/DGEBA blends decrease with an increase in DB and content of NPEHP-n, indicating excellent flowability of NPEHP-n with high DB and disentangled function of NPEHP-n. The mechanical performances of the cured NPEHP-n/DGEBA composites increase distinctly with the increase of the DBs and content of NPEHP-n, including the tensile, flexural and impact strength, showing a maximum value at about 9 wt% of NPEHP-n. The improvements on the tensile, flexural, and impact strengths are 31.7–42.8%, 56.4–76.4%, and 172.0–198.3%, respectively. The results will supply available route for disentangling DGEBA chain to obtain low viscosity epoxy resins and solvent-free coatings. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MECHANICAL properties of polymers
*EPOXY resins
*BISPHENOL A
*NITROGEN
*PHOSPHORS
Subjects
Details
- Language :
- English
- ISSN :
- 03009440
- Volume :
- 127
- Database :
- Academic Search Index
- Journal :
- Progress in Organic Coatings
- Publication Type :
- Academic Journal
- Accession number :
- 133599686
- Full Text :
- https://doi.org/10.1016/j.porgcoat.2018.11.014