Pressure-sensitive materials

Select a process chemistry that is inherently safer (e.g., replace shock sensitive, high temperature sensitive and high pressure sensitive materials with more benign materials, less severe operating conditions)... 

Crystalline polymers are pressure-sensitive materials due to their weak interchain potential. Therefore, they have different crystal structures under different conditions. 

Flexible Packaging Products Pressure-Sensitive Materials Films Adhesives... 

In some industries, special material characteristics, such as heat and/or pressure sensitivity, toxicity, reactivity, etc., are of importance. Particularly in the pharmaceutical industry and some sectors of chemistry these parameters must be considered. While pressure agglomeration methods have only limited applicability for heat- and/or pressure-sensitive materials, toxicity may limit the appeal of tumble agglomeration because of the difficulty to contain dust and avoid contamination of the environment. 

CHEMSULTANTS INTERNATIONAL 9349 Hamilton Drive, P.O. Box 1118, Mentor OH 44061-1118, (216) 352-0218. In-depth background in research, purchasing, pilot plant and manufacturing. Also laboratory testing service, and manufacture of equipment for testing pressure sensitive materials. 

Excellent substrate compatibility Properly compounded adhesives, sealants, and pressure sensitive materials will adhere to almost any surface. Block copolymers have exhibited superior pressure sensitive adhesion to polyolefin and other low energy surfaces. 

The dynamic mechanical analysis shows that both pressure-sensitive materials are heterogeneous blends, i.e., they consist of a gum-r ich phase which coexists with a resin-rich phase of resin and gum. In this respect, they are similar to other pressure-sensitive adhesives containing other resins and rubbers. 

L. H. Sharpe (Bell Labor a tor ies. Hurray Hill, NJ) I d always thought that to be pressure-sensitive, a material had to be 2-phase (the Wetzel model). Apparently, that s not so. Is a pressure-sensitive material, then, just a high-viscosity, viscoelastic fluid Or is this too naive a view ... 

By further modification of this approach to account for pressure sensitivity of the initial material, Bucknall and Paul (2009) obtained the following equation for pressure-sensitive material containing small voids, which can be applied to the description of a polymer blend in which all rubber particles have already fully cavitated ... 

Jeremic, B. 2004. Lecture notes on computational geomechanics Inelastic finite elements for pressure sensitive materials. Technical Report UCD-CompGeoMech-01-2004, University of California, Davis, 2004. available online http //sokocalo.engr.ucdavis.edu/ jeremic/CG/ LN.pdf. 

While this deficiency in adhesive strength is deliberate, the low cohesive strength of pressure-sensitive materials is undesirable. Low... 

Formulations XVIII-XX illustrate the relatively high resin content required by permanently tacky, pressure-sensitive materials. In... 

E. Kaldis, Pressure Sensitive Materials with Valence Instability, High Purity Mater. Sci. Tech-nol. 5th Intern. Symp. Proc., Dresden 1980, Vol. 1, pp. 222/38. 

Piezoelectric materials are pressure-sensitive materials. When subject to pressure (stress) they become polarized and produce an electric field. The prefix piezo- comes from the Greek word pressure. The reverse is true when these materials are subject to an electric field the result is a mechanical strain and displacement. These materials have many industrial applications as transducers, accelerometers, and sensors, and have found use in robotic and biomedical applications. Composites of these materials are also known as smart materials and are used in adaptive structures. 

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