Spencer Silver Invent ?

Ans: Spencer Silver, a chemist at 3M, invented a "low-tack" adhesive in 1968, which became the key component of Post-it Notes. His invention allowed papers to stick together gently without causing damage.

Play do

when and how did they invented ?

in 1930 . It started out as wallpaper cleaner

what properties of the material make it useful

• Play do Encourages Creativity

• Play do has a Sensory Calming Effect

• Play do develops Fine Motor Skill

• what uses does the material have?

• learning experience for kids

  group 6

Spencer Silver invented the low-tack adhesive in 1968 at 3M. During his attempt to create a strong adhesive for aircraft construction, he accidentally developed a weak adhesive made of tiny acrylic spheres that stick lightly and can be removed easily without damaging surfaces.

4o mini

Ans. The uses that wrinkle cotton has is being used in shirt's, pillows, sheets and uniform's. It is really comfortable to wear!

4o mini

• Ruth Benerito was a scientist at the U.S. Department of Agriculture (USDA), where she worked in the Southern Regional Research Center in New Orleans, Louisiana.

• She was focused on research that could enhance the properties of cotton, making it more practical for everyday use. This was during a time when cotton was facing increased competition from synthetic fabrics that were more resistant to wrinkles and easier to care for.

2. Scientific Approach:

• Benerito's approach involved modifying the cellulose molecules in cotton fibers. Cotton is made up primarily of cellulose, which, in its natural state, is prone to shrinking and wrinkling.

• Her research involved developing a way to chemically treat cotton to create stronger, more stable bonds within the cellulose structure, preventing the fibers from moving and thus reducing wrinkling.

3. The Chemical Process:

• Benerito and her team experimented with different chemicals that could cross-link cellulose molecules. The goal was to find a treatment that would stabilize the cotton fibers without compromising their comfort or breath ability.

• The breakthrough came when Benerito discovered that using a treatment involving formaldehyde-based resins would cross-link the cellulose fibers. This chemical process effectively "locked" the fibers into a shape that would resist wrinkles and shrinkage.

• The treatment involved soaking cotton fabric in a solution containing the resin and then setting it with heat. This allowed the fibers to form chemical bonds that reduced their ability to move and wrinkle.

4. Testing and Results:

• Benerito’s team conducted extensive tests to ensure that the new treatment did not weaken the cotton or affect its texture in a way that would make it less comfortable to wear.

• The results were promising: the treated cotton maintained its shape and appearance after washing and wearing, significantly reducing the need for ironing.

5. Outcome and Patents:

• Benerito's process was patented in 1955 under the title "Method of Treating Cotton to Make It Resistant to Wrinkling."

• The invention was significant in making cotton a more attractive fabric for consumers who valued low-maintenance clothing. It led to the production of cotton garments that combined the comfort of natural fibers with the convenience of synthetic alternatives.

ans d : Permanent press fabric is used in clothing, bedding, and home textiles like curtains and tablecloths, thanks to its wrinkle resistance and easy care.

Answer)She invented a material called Kevlar which was a strong,heat resistant and synthetic fiber.

B)When did she invent it?

Answer)In a polymer research lab,she discovered super fiber known Kevlar.In 1965 she made first synthetic fiber.

C)What properties of Kevlar make it useful?

Answer)It has high strength,high modulus,toughness and thermal stability.

D)What use do Kevlar has?

Answer)It makes body of an aircraft,body armor,bulletproof vest,car breaks and boats.

Group 5