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Latex is a type of natural rubber made from the sap of rubber trees. The sap is collected and processed into latex, which is then used to produce rubber gloves, condoms, and balloons, among other things. Latex is unique in that it is a liquid at room temperature but transforms into a solid when exposed to air. This is why when latex items are originally made; they typically have a balloon-like structure. Latex is a polymer, which means it is made up of tiny molecules linked together in a chain. It is an organic chemical since all of its tiny molecules are carbon-based.
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Key Takeaways: Latex, Rubber, Natural Latex, Synthetic Latex, Polymer, Plants, Opium, Monomer, Petroleum, Proteins, Chemical Compound, Synthetic Latex
Natural Sources of Latex
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Although latex is frequently used interchangeably with the word rubber, it technically refers to any liquid medium that holds a suspension of small polymer particles. Although latex is a natural plant product, it can also be produced through chemical methods.
Natural latex is a plant substance that is most commonly associated with the rubber tree, but it may be found in about 10% of all plants. Opium, for example, is the dried latex of the opium plant. Latex is not the same as sap; it is a distinct material produced by the plant as an insect repellent.
When exposed to the air, latex in plants is a complex mixture of proteins, alkaloids, starches, sugars, oils, tannins, resins, and gums that coagulates. Plants utilise latex to protect themselves from insects by sealing themselves after an injury. Latex can also be synthesised by polymerizing and suspending a number of chemical compounds in an emulsion.
Latex Harvesting From Rubber Plants
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What is Natural Latex?
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The natural latex chemical compound is a naturally occurring polymer with elastomeric characteristics. Elastomeric polymer is another name for it. Weak intermolecular forces hold the polymer chains together in elastomeric polymers. The polymer can be stretched because of the weak binding forces. In between the chains, a few crosslinks are inserted, which aid the polymer's return to its original location after the stress is released.
Rubber latex, which is a colloidal dispersion of rubber in water, is used to make it. Natural rubber is also known as cis - 1, 4 - polyisoprene and is a linear polymer of isoprene (2-methyl-1, 3-butadiene). The cis-polyisoprene molecule has a coiled structure and is made up of many chains linked together by weak van der Waals interactions. As a result, it has elastic qualities and can be stretched like a spring.
What is Synthetic Latex?
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Synthetic rubber is any vulcanisable rubber, such as a polymer, that can be stretched to double its original length. When the external stretching force is withdrawn, it returns to its previous shape and size. Synthetic rubbers are homopolymers or copolymers of 1, 3 butadiene or its derivatives with another unsaturated monomer.
Role of Latex in Plants
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The role of latex in plants has been elaborated below:
- Over 20,000 flowering plant species from over 40 families produce latex. Both dicots and monocots are included.
Latex has been discovered in 14 per cent of tropical plant species and 6% of temperate plant species. Lactarius deliciosus and other milk caps are examples of fungal species that create latex when injured.
This indicates that it is the result of convergent evolution and has been selected multiple times. - Slugs will consume latex-drained leaves but not undamaged leaves, many insects break latex-carrying veins before feeding, and the latex of Asclepias humistrata (sandhill milkweed) kills by trapping 30% of freshly born monarch butterfly caterpillars.
- Latex contains 50–1000 times more defensive chemicals than other plant tissues, according to various sources.
These toxins include those that are also toxic to plants and are made up of a wide spectrum of poisonous or "antinutritive" compounds.
Latex is aggressively transferred to the injury site, which can be more than 70 cm in the case of Cryptostegia Grandiflora. - The clotting ability of latex is useful in this defence because it reduces waste and captures insects and their mouthparts.
- Latex is also used as a transport and storage medium for plant nutrients such as sugar, salt, alkaloids, tannin, enzymes, and plant waste. It also plays a role in managing water concentration in different plant sections.
It allows for the intricate mixing of various components such as waxes, fats, resins, gums, and others. - The latex chemical compound enters the circulatory system and travels in a longitudinal direction. As a result, it aids in the transport of various substances from one location to another.
Latex also serves as an excretory reservoir for a variety of plant substances. Several waste compounds are excreted by the plant into the latex solution.
Applications of Latex Chemical Compound in Everyday Life
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The numerous uses of latex in day to day life are as follows:
- Natural rubber is the most important product made from latex; more than 12,000 plant species produce latex-containing rubber, albeit the rubber produced by the vast majority of those species is unfit for commercial use.
- Mattresses, gloves, swim caps, condoms, catheters, and balloons are just a few of the things made from latex.
- Opium is the dried latex of the opium poppy, which is the source of several useful analgesic alkaloids like codeine, thebaine, and morphine, the latter two of which can be used in the synthesis and manufacture of other (typically stronger) opioids for medicinal use, as well as heroin for the illegal drug trade.
- Non-analgesic alkaloids from the opium poppy, such as papaverine and noscapine, are medically beneficial.
- Latex is used in a variety of garments. It tends to be skin-tight when worn on the body (or applied directly by painting), giving it a second-skin look.
- Synthetic latexes are employed in coatings (such as latex paint) and glues because they solidify when the water evaporates, causing the polymer particles to agglomerate.
- As a result, these synthetic latexes can produce films without polluting the environment with potentially harmful organic solvents.
- Cement additives and the concealment of information on scratchcards are two further applications. In immunoassays, latex, usually styrene-based, is also employed.
Latex Products
Things to Remember
- Latex is a type of natural rubber made from the sap of rubber trees. Rubber is latex. It is usually made up of roughly 55% water and 40% rubber.
- Latex comes from a variety of natural sources. The rubber tree is one of the most common. Latex is harvested from the tree and used to produce rubber gloves, condoms, and balloons, among other things.
- Latex is made up of a variety of materials, including resins, oils, waxes, and proteins. It's found in a range of commercial items, including adhesives, paints, and rubber.
- It improves the plant's defence against predators and parasites, as well as environmental stressors including heat and drought.
- Latex is a long-lasting, water, sunlight, and chemical-resistant substance. It's also hypoallergenic and non-toxic.
- Latex chemical compound is made out of petroleum-based compounds in some cases. These compounds are used to make synthetic rubber polymers, which are then clumped and dried before being transferred to a production facility.
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Sample Questions
Ques. Explain the Composition of Latex. (3 Marks)
Ans. Latex is made up of around 55 to 65 per cent water and 30 to 40 per cent rubber stuff. Sugar, resin, protein, and ash may also be present. Latex is exposed to sulphur, carbon black, and oil when it is turned into a workable material like a surgical glove. These materials are used to make latex more durable and easier to work with.
Ques. Describe a few properties of Natural Latex. (3 Marks)
Ans. Some properties of Natural Latex are as follows:
- Processed natural latex transforms into rubber with outstanding wear resistance, tensile strength, resilience, and elongation after processing.
- It is resistant to typical abrasives and performs well in low-temperature situations; nevertheless, latex-based rubbers need to be treated with particular chemicals and additives because heat, sunlight, and even oxygen may quickly damage them.
- Latex should not be used in situations that contain petroleum products or solvents.
- When working with latex, the recommended temperature range is between -55 and 82 degrees Celsius.
Ques. State a few properties of Synthetic Latex. (3 Marks)
Ans. Styro Butane Rubber is the synthetic latex that comes closest to mimicking the qualities of natural latex (SBR). This sort of synthetic rubber is inexpensive to manufacture and has several advantages over natural latex. It is more water-resistant and stronger than natural latex, making it an excellent choice for tyre manufacturing.
Ques. What are the Allergic reactions to latex? (3 Marks)
Ans. The allergic reactions to latex can be described as
- Due to repeated inhalation or physical contact with latex, some people acquire an allergy to it.
- Proteins in natural latex can trigger reactions in those who use latex materials on a regular basis, such as doctors and nurses.
- To counteract this issue, the medical sector is working to develop replacements for latex-based medical goods.
Ques. Explain the harvesting process of Latex (3 Marks)
Ans. The harvesting process of latex involves the following steps:
- Only until a rubber tree is mature—roughly five years old—can the latex harvesting process begin. The tree is now prepared to begin producing rubber.
- Tappers peel tiny slices of bark off rubber trees to tap them. The plant ducts, which contain latex, are disrupted as a result. When these channels are disrupted, latex can run down grooves cut into the tree by the tappers. Latex cascades down the grooves and into the huge cups.
- Tappers take care of these cups, collecting latex when they fill up and refilling them so that the tree can continue to be harvested until it is properly tapped.
Ques. How is latex processed into rubber? (3 Marks)
Ans. The latex is processed into rubber through the following method:
- Rubber production begins with the collection of latex sap from rubber trees during harvesting.
- Following that, firms filter the latex before packaging it in barrels for transport.
- Companies add acid to latex when it's ready to be manufactured into smoked rubber sheets. The substance clumps as a result of this. The clumped fluid is rolled into sheets. This eliminates the water from the sheets, allowing them to be dried and smoked.
- Latex is finally prevulcanized. Chemical treatments and low-temperature mild heating are used in the prevulcanization process. It is easier to carry latex after it has been prevulcanized. The substance can now be transformed into ordinary rubber with extra heating.
Ques. State the properties of Latex Material (3 Marks)
Ans. The Properties of Latex material are as follows:
- Latex is an outstanding rubber material after processing.
- Latex's tensile and elongation properties, as well as tear resistance and overall resilience, are well-known. Latex is unaffected by the majority of typical abrasives.
- Low temperatures are not a problem, but hot temperatures can be. Latex can corrode at temperatures above 82 degrees. To protect latex from corrosion caused by heat, sunshine, and oxygen, treatment chemicals can be added.
- Latex should not be used in conjunction with petroleum compounds or solvents. This may cause the latex to break down.
Ques. Describe the functioning of Latex in Plants. (5 Marks)
Ans. The functioning of latex in plants is deceived below:
- Plants use latex for a variety of purposes. It serves as both a source and a sink for various plant waste products, thereby acting as an external reservoir. The plant employs latex to conduct different substances to different regions of the plant since latex travels longitudinally. Latex is a polymer of many chemicals such as amino acids, rubber, wax, fat, sugar, and so on.
- The plant also uses latex as a defence mechanism. It has been discovered that it is more effective than other plant defence mechanisms such as thorns and hairs. It includes poisons that have the ability to kill or discourage a variety of herbivores. The latex of the sandhill milkweed plant, for example, can capture and kill newly hatched monarch caterpillars.
- In addition, latex has clotting characteristics in some plants. This clotting ability aids in the reduction of plant product waste. It also exerts a sticky effect on the mouthparts of some insects, stopping them from damaging the plant further.
Ques. Natural rubber is obtained as latex which is a milky white fluid from rubber trees. So, Latex is a: (5 Marks)
(a) Mixture of gum and rubber
(b) Colloidal dispersion of rubber in water
(c) rubber solution in water
(d) paste of water, clay and rubber
Ans. (a) Mixture of gum and rubber
Latex is a term used to describe natural rubber. Rubber trees produce latex, which is a milky white fluid. Latex is a water-based colloidal dispersion of rubber. Latex has a negative electrical charge. To put it another way, latex is a colloidal mixture of rubber and water.
Negatively charged protein membranes make up each rubber particle. Natural rubber is made from latex that has been coagulated. The latex, on the other hand, does not coagulate on its own. To aid coagulation, acid is applied to the latex. Because the acid contains the hydrogen ion, the negatively charged protein membrane is neutralised.
As the similar negative charge on the particles is neutralised, all of the rubber particles no longer repel each other and collide. The coagulation of latex is aided in this manner, resulting in the rubber molecule clumping together and the rubber is obtained.
Ques. In vulcanization of rubber, (5 Marks)
(a) Sulphur reaction to form a new compound
(b) Introduction to Sulphur Cross-links
(c) Sulphur forming a very thin protective layer over rubber
(d) All of the above
Ans. (b) Introduction to Sulphur Cross-links
Rubber vulcanization is a technique that improves the suppleness and strength of rubber by heating it in the presence of sulphur. This results in the development of three-dimensional cross-linking of polyisoprene chain rubber molecules, which are connected together by a Sulphur atom.
The phases of vulcanization are as follows.
- Sulphur (5-30%) is added to the crude rubber, along with additional additives such as activators, accelerators, anti-oxidants, and softeners.
- Moulding: The rubber is moulded in this step because it is necessary to form the rubber before the heating stage because crosslinking prevents the rubber from being shaped.
- Heating: The mixture is heated to between 250 and 400 degrees Fahrenheit in this step.
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