1. Bonding of Epoxy and Methacrylate Adhesives on Common Composites Substrates SAMPE Brazil São José dos Campos, São Paulo, Brazil October, 2017

2. Contents Introduction Procedure Results Conclusions Substrates Bonding
Mirna Robles – SAMPE Brazil 2017

3. Introduction Epoxy & Methacrylate Adhesives
Epoxy A – Cured at RT
Epoxy A – Heat Cured
Methacrylate A – Cured at RT
Methacrylate B – Cured at RT
Common Substrates in the Marine, Wind Energy, and General Composites Markets
Vinyl Ester
Polyester
DCPD (DiCycloPentaDiene)
Epoxy
Infused Epoxy
ASTM Standard D1002
Instron Testing Machine Model 5567
Mirna Robles – SAMPE Brazil 2017

4. Procedure Substrates
40 different types of specimens to test for single lap shear strength
Unidirectional fiberglass with 0° fiber rovings orientation with respect to the lap shear test
Unidirectional fiberglass with 90° fiber rovings orientation with respect to the lap shear test
Lap shear test
Mirna Robles – SAMPE Brazil 2017

5. Procedure Bonding Specimen preparation per ASTM D1002 requirements.
Dispensing performed by using cartridges and hand held dispensing guns for specific mix ratio for each type of adhesive.
Bonding preformed under normal conditions: 23°C RT & <70% of RH.
Epoxy Adhesive A
Epoxy A – Cured for 24 RT
Epoxy A – Heat Cured for 3 50°C
Average of 3 samples for each type of specimen
Methacrylate Adhesives
Methacrylate A – Cured for 24 hours at RT
Methacrylate B – Cured for 24 hours at RT
Average of 5 samples for each type of specimen
Mirna Robles – SAMPE Brazil 2017

6. Results
*The results of the lap shear strength tests obtained in this study are used with the only intention of comparing the different types of specimens among them, and not for stating the strength values of the adhesives themselves.
Mirna Robles – SAMPE Brazil 2017

7. Results
Specimens made with Epoxy adhesive A on DCPD HLU substrate cured for 3 50°C. The test was 0° orientation, showing a cohesive single lap shear failure at an average of 3.01 MPa with an average force of 4.44 kN.
Specimens made with Methacrylate adhesive B on HLU DCPD substrate cured for 24 RT. The test was 90° orientation, showing a cohesive single lap shear failure at an average of 4.75 MPa with an average force of 7.11 kN..
Mirna Robles – SAMPE Brazil 2017

8. Results
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9. Results
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10. Conclusions
In general, for achieving the best bonding strengths, the fiber rovings in the composite substrate must be oriented at 90° with respect to the possible shearing effect of the bonded area (most possible debonding direction).
Each one of the types of adhesive showed their best shear strength when bonding each one of these substrates:
Each one of the types of adhesive showed their worst shear strength when bonding each one of these substrates:
*The results of the lap shear strength tests obtained in this study are used with the only intention of comparing the different types of specimens among them, and not for stating the strength values of the adhesives themselves.
Mirna Robles – SAMPE Brazil 2017

11. Thank you! Obrigada! Questions / Comments? Mirna Robles, M. S.
Composites Technical Service Engineer – Americas
12650 Directors Drive
Stafford, TX., USA, 77477
(office) / (mobile)
Mirna Robles – SAMPE Brazil 2017