Rabu, 03 Mei 2017

Chemical Articles



Why Rubber Can Grow?

Rubbles If there is a statement will make us really fascinated by the molecules, maybe the following, rubbery or stretchy because they are composed of molecular-grade molecules. Rubber bands, for example, can be elongated because each molecule itself has a wake up like a mini rubber band.
Rubber molecules have a long, thin form of worms that lazy like to take a coiled position but can be straightened when pulled right on the heads and tails. A piece of rubber on its hiccup like a can of worms that are all tangled up to a tangle.
But imagine we can straighten a can of worms by pulling our heads and tail randomly, all going to hold each other in different directions. Two worms must be intertwined in such a way that the pull on one will be extended to others and so on. All we need is a can of worms each other glued together several points along their bodies. Such is the arrangement of rubber molecules. However, the arrangement is not so, ie, when new rubber latex is tapped from the tree and then thickened and pressed into rubber clumps. The molecules are not strongly bonded together, so that when warmed they can slip each other and this causes the raw rubber to thud when dropped to the floor. So raw rubber is not yet qualified to be used as car tires.

That's why humans intervene to glue the molecules. They use a simple process called vulcanization, which heats rubber together with sulfur (sulfur). Sulfur atoms form bridges between rubber molecules, which allow them to be pulled away but still want to regain their original position. That is why processed rubber is elastic. The molecules can run but the connecting bridges always demand them back.

Vulcanization makes soft, brittle and sticky raw rubber strong enough and chewy to use as a car tire. The process was discovered in 1839 by Charles Goodyear (1800-1860) -the Goodyear, whose name was abandoned as a well-known tire brand, which has been trying for decades to find a way to make rubber stronger. One day he accidentally spilled a bit of a mixture of raw rubber and sulfur liquid onto a stove that was still hot and it turned into a rubber that is strong and elastic. His findings made him famous but did not make him rich. Even at death he left a great deal of debt.
However it is he who allows us to enjoy Football Cup matches, Formula One F1 and Formula One Racing ..

And What makes it warm?

When we stretch the rubber band, we exert energy into it and it warms up. The energy comes from muscle, so we need to eat calorie foods to replace the energy it has released.
When a rubber band is stretched out, it causes the molecules to stretch with a more orderly order, such as marching than when not stretched, when the molecules are sitting huddled lazily in irregular directions. That's why to be orderly rubber molecules require more energy-to become hotter-than when molecular molecules are relaxed.
I just inserted the effect of the Second Law of Thermodynamics. This natural law expresses the relationship between energy and entropy, the degree of disorder an order: the degree of randomness, the patternless pattern. The Second Law recognizes that anything in nature has a tendency to experience energy reduction-all things tend to slow down and become cold and to experience increased entropy or irregularity-everything tends to become more random and spread scattered. If we want to overcome the tendency to become more orderly (increase in entropy), we are forced to direct the energy to regulate. It is a natural reality that can not be avoided, everything that happens is an exchange between energy and entropy.

Literature: http://www.chem-is-try.org/wp-content/uploads/2009/08/karet-gelang.jpg

18 komentar:

  1. What chemicals react in rubber so rubber can be elastic?

    BalasHapus
    Balasan
    1. Rubber is a polymer of isoprene (politerpene) units composed of 5000 to 10,000 units in a chain without branches. Allegedly, the first three bonds are trans and then cis. This compound is contained in the latex of the producing tree. At normal temperatures, the rubber is not shaped (amorphous). At low temperatures it will crystallize. As the temperature increases, the rubber will expand, in the direction of its long axis. The temperature drop will restore this expanding state. This is the reason why rubber is elastic.
      Thus, the compound that causes elastic rubber is isoprene or politerpene.

      Hapus
  2. Does the color of rubber contain chemicals? What is that name?

    BalasHapus
    Balasan
    1. Which gives color to the rubber that is filler and pigment.
      The filler may be an inorganic compound may also be an organic compound.
      Inorganic fillers commonly used include kaolite clay, calcium carbonate, white pigment, titanium oxide (TiO), lipoton (mixed zinc sulphide and barium sulfate) and carbon black. Whereas commonly used organic fillers include high-styrene resins, resolinol formaldehyde resins, lignin.

      Hapus
  3. What are the reactions to rubber processing?

    BalasHapus
    Balasan
    1. I have difficulty in writing her kiminya reaction. But i can explain it. Natural rubber is composed of isoprene monomers or 2 methyl 1,3 betadiene.
      Natural rubber is soft, adherent, and easily oxidized. To make it harder and more volcanically stable, the natural rubber is heated at 150 ° C, with a small amount of sulfur. In this way the double bond on the open rubber then occurs sulfur bridge bonding between its molecular chains. Rubber is extracted from latex (rubber tree sap), the result of retreading is used for vehicle tires.

      Hapus
  4. What are the utility or purpose of rubber making?

    BalasHapus
    Balasan
    1. For the manufacture of various kinds of tools for home use or outdoor use such as shoes soles, car tires and various other products.

      Hapus
  5. What causes rubber properties is elastic?

    BalasHapus
    Balasan
    1. Elastic rubber is caused by isoprene or politerpenes.

      Hapus
  6. "They use a simple process called vulcanization, which heats rubber with sulfur (sulfur)." Please explain what kind of vulcanization process?

    BalasHapus
    Balasan
    1. Vulcanization or vulcanization is a chemical process for converting rubber or related polymers into more durable materials through the addition of sulfur or other equivalent "curatives". These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. The vulcanized material is less sticky and has superior mechanical properties. A large array of products are made with rubber vulcanization including tires, shoe soles, hoses, and hockey pucks. This process is named after Vulcan, the Roman god of fire. Hard vulcanized rubber is known as ebonite or vulcanite and is used to create hard articles such as bowling balls and clarinet mouthpieces.

      Hapus
  7. What is the use of sulfur in rubber? If it is very influential is there any substitute of sulfur material?

    BalasHapus
    Balasan
    1. Sulfur on rubber is very influential because it makes rubber become elastic. No one has been able to replace me, because it is related to the vulcanization process.

      Hapus
  8. What are the benefits of rubber tree parts for humans and the environment?

    BalasHapus
    Balasan
    1. Here are the benefits of rubber trees:
      1. Sap
      Rubber sap is called latex. This is the most valuable part of the rubber tree. Rubber sap is much needed by various industries. The simplest example is the sap is the raw material of vehicle tires, soccer ball, and others. So no wonder, if the price of rubber latex is quite expensive. In addition, rubber latex can also be used as a traditional medicine to heal insect bites.
      2. Seeds
      Rubber plants are usually propagated generatively through seeds. Therefore, farmers can sell the rubber seeds to the collectors. These seeds can later be grown into rubber seedlings that are ready to be planted. Children usually make rubber seeds as toys to pit their power. Even rubber seeds can be consumed by humans in a processed first. As for you who like fishing, you can use rubber seeds that have been burned into bait.
      3. Trunk
      Rubber can be used for building materials because it has good strength. The selling price of rubber wood is usually calculated per kilogram. Later rubber wood can be formed into sills, doors, and other furniture. Plywood factories also often use rubber wood powder as the raw material. While the branches and branches of rubber trees can be used as firewood.
      4. Roots
      Rubber trees have a root system that type tunggang. This root is located at the bottom of the plant and serves to absorb water and nutrients from the soil. The result of the photosynthesis process is also partially stored in the roots of the plant. For humans, the roots of a rubber tree can be used to make knives, machetes, and other traditional weapons.

      Hapus
  9. Try to explain energy and entropy

    BalasHapus
    Balasan
    1. Energy is the ability to do business. In this universe, the provision that everything tends to reduce its energy. For example, water in a high dam always tries to release its gravitational potential energy by plunging down. Arriving at the bottom, the gravitational potential energy will be discharged to drive the turbine and will produce electricity that illuminates our home.
      Then that is entropy. Simply put, entropy can be interpreted as irregularity, a condition when everything takes on a chaotic, disorganized order. This state applies to any particle composing a substance, in this case atoms and molecules. At certain times, they can be in an orderly state (low entropy), but in other circumstances they can be in a chaotic state (high entropy). If the other factors are the same (such as the energy) then the provision that everything tends to increase the entropy.

      Hapus

CHEMICAL LEARNING VIDEO

Crude oil Hydrocarbon compounds are widely used in everyday life such as petroleum. Because of the importance of petroleum for the su...