Adhesive strength increasing

As a result of oxidation, the adhesion strength between PE and A1 is found to increase by about 8 to 28 times. The adhesion strength increases with an increase in carboxyl content, total amount of oxo- groups, and the combined carboxyl and carbonyl content. 

For bioadhesive applications, anionic polymers appear to provide the most effective balance between adhesiveness and toxicity, with carboxylic materials preferred over sulfonic polymers [400]. Polyfacrylic acid) microparticles have been identified as particularly effective bioadhesive materials [402]. Studies with poly(acrylic acid) microparticles have indicated that, while water-swollen particles exhibit good bioadhesion, dry polymer particles give no adhesion at all. In addition, adhesive strength increases as the degree of ionization of the polymer is increased [402]. Thus the expanded nature of the polymer network is important to mucoadhesion, probably via polymer interdiffusion and entanglement with mucin [403],... 

Increased viscosity Increased block resistance Increased tensile strength Increased water resistance Increased adhesive strength Increased solvent resistance Increased dispersing power... 

As the content of AA increases, the crystallinity decreases, which implies that clarity also Increases. Similarly, adhesion strength increases because of the increase in polarity, and the heat seal temperature decreases due to the decrease in crystallinity. 

With vacuum treatment of the specimens (at 200°C, 103 Pa) for 10 days, the content of the monomer in the adhesive layer decreased and the adhesion strength increased. The character of adhesion failure of the joint changed to cohesive type. The data allow a more complete explanation of the so-called latent period— the period of achieving the maximum adhesion strength. It is evident that the strengthening of some adhesive-bonded joints in the course of time is caused by volati-... 

As Fig. 2.22 shows, the adhesion strength increases as o-adj,Hg fTadhair decreases. RS substances were used to control the interphase tension. The thermodynamic work of adhesion is related to the surface tension at the bormdaries between adhesive and air, between adhesive and sohd, and between sohd and air by the relationship... 

Comparing the results obtained, the various influences of OP-10 and DC-10 on polyester resin adhesion can be assessed. Whereas introduction of OP-10 leads to reduction of adhesion strength over the entire concentration range, with DC-10 the introduction of small concentrations (2wt%) causes a reduction of adhesion strength over time. Increasing DC-10 concentration in the system increases the adhesion strength, and maximum adhesion strength increase is achieved with introduction of 6 wt% of that surfactant. 

It is interesting to note that, despite the increase of the coefficient of thermal expansion by incorporation of flexibilizer into the epoxy resin system, the torsional adhesive strength increases to some extent with decreasing temperatures, as is shown in Fig. 25. 

Garda A. J., Ducheyne, R, and Boettiger, D., CeU adhesion strength increases linearly with adsorbed fibronectin surface density. Tissue Eng. 3,197,1997. 

In such cases, it has been observed that the adhesive strength increases with increase in or Tg of the substrates up to a certain point, followed by a decrease in adhesive strength. Such plots can easily be transformed into plots of adhesive strength vs. 

Woolfson et al. recently reported on a mucoadhesive patch to which fluorouracil is mixed. The patch (diameter 26 mm) consists of a film made of a mixed solvent of ethanol water — 3 7, 2% (w/w) Carbopol 981 and a glycerin plasticizer at 1% (w/w). A backing material made of a heat-treated PVC is applied to this film (see Fig. 5). They measured the adhesive strength for a human uterus, its drug delivery characteristics, and its tissue permeability. The adhesive strength increased as the film thickness increased to 0.09 mm as shown in Fig. 6 [12]. 

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