Influence factors of determining optimal organic solvents for swelling cured brominated epoxy resins to delaminate waste printed circuit boards

In the previous study, organic solvent dimethyl sulfoxide (DMSO) could effectively delaminate waste printed circuit boards (WPCBs) by swelling cured brominated epoxy resins (CBER). To find more organic solvents which can swell CBER, the total and three-dimensional Hansen solubility parameters (3d-HS...

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Bibliographic Details
Published in:Journal of material cycles and waste management 2018-01, Vol.20 (1), p.245-253
Main Authors: Zhu, P., Yang, Y. Z., Chen, Y., Qian, G. R., Liu, Q.
Format: Article
Language:English
Subjects:
Bromination
Chemical bonds
Circuit boards
Civil Engineering
Cresol
Dimethyl sulfoxide
Dipole interactions
Engineering
Environmental Management
Epoxy resins
Functional groups
Glass transition temperature
Hydrogen bonding
Mathematical analysis
Organic solvents
Original Article
Polymers
Printed circuit boards
Printed circuits
Solubility
Solubility parameters
Solvents
Swelling
Test procedures
Theoretical analysis
Transition temperatures
Waste Management/Waste Technology
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Summary:In the previous study, organic solvent dimethyl sulfoxide (DMSO) could effectively delaminate waste printed circuit boards (WPCBs) by swelling cured brominated epoxy resins (CBER). To find more organic solvents which can swell CBER, the total and three-dimensional Hansen solubility parameters (3d-HSP) of CBER in WPCBs were calculated by a group contribution method and an equilibrium swelling degree method. During testing equilibrium swelling degree, seventeen industrial common organic solvents were used to swell CBER in WPCBs. The results were that the total solubility parameter of CBER ( δ t ) was 24.6–26.4 (J/cm 3 ) 1/2 , and 3d-HSP were that dispersion force ( δ d ) was 20.9(J/cm 3 ) 1/2 , intermolecular dipole interaction force ( δ p ) was 11.1(J/cm 3 ) 1/2 , and hydrogen-bonding force ( δ h ) was 11.6 (J/cm 3 ) 1/2 . Then, 3-cresol was chosen to swell CBER in WPCBs according to its total and 3d-HSP. Result indicated that the WPCBs were delaminated completely in 3-cresol solvent. Finally, experimental results and theoretical analysis showed that the glass transition temperature (Tg) and solubility parameter of CBER were two very important factors for choosing organic solvents to delaminate the WPCBs. In addition, interaction forces of molecular functional groups between CBER and organic solvents were also an influence factor.
ISSN:1438-4957
1611-8227
DOI:10.1007/s10163-016-0574-0