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Influence of glass transition temperature Tg on peel strength of pressure sensitive adhesive
Release time:2018-06-22 Browse:2179seconds

Judging the bond performance of pressure sensitive adhesive, it can be judged by some physical indexes of pressure sensitive adhesive. The commonly used indexes include peeling strength, ring initial stickiness, rolling ball initial adhesion and sticking. The peeling strength is one of the most important indexes, which reflects the bond strength of the pressure sensitive adhesive to the base material. Today, it tells you some important factors that affect the peel strength - the vitrification temperature Tg.

The Tg or Tan delta value of the hot melt pressure sensitive adhesive is the key factor determining the peel force. The Tg of the general hot-melt pressure sensitive adhesive is usually in the range of -10 to 10 degree C. In this temperature range, the peel force decreases with the decrease of Tg. This is because when the Tg of the formulation decreases, the loss tangent (Tan delta) at room temperature will also decrease (the whole Tan delta curve translates to the low temperature region). Therefore, the tendency of cold flow at room temperature and the elongation of adhesives during separation will be smaller. According to the same principle, if the Tg of the adhesive is fixed, when the test temperature rises (away from the peak value of the Tan delta), the loss angle tangent (Tan delta) at this test temperature will decrease and the peeling force decreases. Therefore, the size of pressure sensitive adhesive Tg or loss tangent value (Tan delta) is a good index for determining the flow or wetting characteristics of pressure-sensitive adhesive.