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Molecular behavior at buried epoxy/poly(ethylene terephthalate) interface
Chi Zhang1, John N Myers, Zhan Chen
1Department of Chemistry, University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 30, 2014
Summary
Epoxy adhesion to poly(ethylene terephthalate) (PET) was clarified. Epoxides and amines modified PET, enabling cross-linking for strong adhesion, crucial for microelectronics packaging.
Area of Science:
- Materials Science
- Surface Chemistry
- Polymer Science
Background:
- Epoxies are vital in microelectronics packaging underfills.
- Strong adhesion of epoxies to substrates is critical for device reliability.
- The molecular mechanisms of epoxy-amine adhesion to substrates are not fully understood.
Purpose of the Study:
- To investigate the molecular mechanisms behind epoxide-amine mixture adhesion to poly(ethylene terephthalate) (PET) interfaces.
- To elucidate the role of interfacial interactions in epoxy curing on PET substrates.
- To provide insights into improving adhesion for microelectronic packaging applications.
Main Methods:
- Attenuated total-internal reflection Fourier transform infrared (ATR-FTIR) spectroscopy.
- Sum frequency generation (SFG) vibrational spectroscopy.
- Adhesion strength measurements with varying silane additives.
Main Results:
- Epoxide and amine components diffused into and modified the PET film at the interface.
- Epoxy curing involved cross-linking with the modified PET, leading to strong adhesion.
- Reactive silanes enhanced adhesion by cross-linking, while nonreactive silanes hindered it.
Conclusions:
- The study clarifies the molecular mechanisms of epoxy-amine adhesion to PET.
- Interfacial modification and cross-linking are key to achieving robust adhesion.
- Findings offer guidance for designing advanced microelectronic packaging materials.
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