Sticking Stiffening

Plants and some algae store food in the form of starch. In plants, starch is mainly found in seeds, roots, and tubers as well as in stems, leaves, fruits, and even pollen. Grain seeds, such as corn kernels, contain up to 75% starch. Therefore, it is an important component of the carbohydrates in the diet and a very good source of energy for the body. Starch is found in foods such as cereal, pasta, and potatoes, and cornstarch is used to thicken sauces. Laundry starch is a liquid form of starch used to stiffen the collars and sleeves of shirts. An advantage of using it is that dirt and sweat will stick to the starch instead of the shirt textile fibers, with the result that collar rings are easily washed away with the starch. 

If the paste starts sticking to your hands, add some cornstarch to stiffen it up. Note that the more cornstarch you add, the quicker your paste will dry. 

A match consists of a shank or stick of short, thin combustible material such as wood or resin-stiffened cardboard, tipped with flammable, solid materials, often phosphorus-based, along with binders, friction enhancers, and inert materials. When heated through friction or shock as the match is struck, the tips easily ignite with sufficient heat to cause the shank to combust. Strips of cardboard matches are stapled into blocks, books, or cards, while wooden matches are often distributed in boxes ... 

Designers can minimize the stick slip by choosing materials which do iK)t experience a drop in friction when sliding commences or by stiffening the con nents so that the potential energy stored when they are deflected is minimized. However, these two approaches are often in conflict with each other. Efforts to stiffen a polymer by the addition of glass fibers can cause the occurrence of stick slip to increase, an example of which is shown in the data for polypropylene presented in this paper. 

A comparison of the occurrence of stick-slip and the static COF for FPP and UPP shows that the addition of glassfibers to PP increases the occurrence of stick slip and decreases the static COF. The glassfibers stiffen the FPP which will result in a smaller contact area and a lower value of fiiction. It is possible that the addition of glassfibers to PP alters the relationship between the static COF and the contact time which would make FPP experience a drop in fiiction when sliding occurred. However, the effect of contact time on the COF of P was not included in the test program.. 

Starch is widely used in laundry to stiffen collars, sleeves, and petticoats, and also helps with cleaning. Sweat and dirt preferentially sticks to starch rather than to the fibers of the clothing. This then washes away along with the starch during laundry, and then more starch would be reapplied for... 

Fillers are added to PVC compounds to mainly reduce the cost. Additional technical improvements are also desirable such as better opacity, electrical properties, UV resistance, thermal properties, reduced plate out and sticking. Fillers are wet by the resin molecules and secondary bonds form between them. The normal effect of fdler is to stiffen the resin systems, i.e., increase mechanical properties. Small amounts of filler may behave abnormally, yielding soft products. After a certain amount of filler is added, the normal effect of filler is seen i.e., increase of modulus and hardness. Fillers also increase the melt viscosity with a resultant reduction in processing rates. Plasticizer levels are adjusted to compensate this problem. 

Uses Flow aid, compression aid in powds. stiffener in stick prods, such as antiper-spirants... 

Uses Emulsifier, emollient, opacifier, lubricanL stabilizer, suspending agenL thickener, gloss aid for anhyd. systems, cosmetic and topical phamiaceulical creams stiffener for stick formulations... 

Uses Surfactant, emollient, thickener, and stiffener for creams and lotions, personal cleansers, stick cosmetics, pharmaceuticals Properties Wh. to off-wh. flakes sol. in alcohol, min. oil, and peanut oil insol. in water m.p. 50 C acid no. 0.70 sapon. no. 120 Toxicology LD50 (oral) > 10 ml/kg practically nontoxic min. skin irritation, no eye irritation... 

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