Humidity testing copolymer

Figure 10. Peel strength durability in a 5TC condensing humidity of acetone-degreased and EME 67 (67 wt% mercaptoester unit copolymer) coupling agent treated 1010 carbon steel/epoxy peel test panels. The epoxy top-coat formulation is given in Appendix 4.

Copolymer test specimens were prepared by pressing slabs for 0.5-3 min at temperatures approximately 20°C above the copolymer melting point, followed by cooling under pressure to room temperature in 5-10 min. Test samples were conditioned at 24°C and 50% relative humidity for at least 48 hr before testing. Stress-strain and tear-strength measurements were made on 0.6 to 0.8-mm-thick specimens. Thicker specimens yield lower values for tensile strength and elongation at break. The test methods used were ... 

Lap shear strength of the pieces of wood with plastic injection molded to them was tested on a Instron Model 4200 universal testing instrument. Experimental conditions were as follows room temperature, 23°C room relative humidity 50% crosshead speed, 2.54 mm/min with the sample in hand-fastened grips and an aluminum specimen holder. The lap shear strengths of the wood-plastic samples are summarized in Table 9. The copolymer samples were fractionated by benzene extraction. The reaction product was labeled product A. The benzene extract of the product became ben. ex. Whereas the benzene-insoluble portion of the product was labeled product B. 

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