ADVANTAGES FOR THERMOSETTING POLYMER Epoxy Epoxy can bond strongly to most materials including metals, concrete, glass, ceramics, stone, wood and leather. Exceptions are plastics materials like polyethylene, polypropylene, Teflon and so on. It is low viscosity and very little shrinkage on curing, which makes it suitable to be used to produce reinforcement fibers and providing good dimensional stability. Besides that, epoxy has an excellent water, heat and chemical resistance. It has an excellent adhesion as well, hence their modification as epoxy glues.
They are microwavable! Polypropylene is also dishwasher safe! It has softening region of about 150 °C and a melting point of 160-170 °C. It is resistant to most acids and alkalines as well as organic solvents It has a good chemical and heat resistance compared to other plastics. It is a non-conductor of
6. POLYESTERAMIDES Introduction: -Structure of Polyesteramides- Polyesteramides are group of biodegradable polymer that covers both specialties in the biomedical field and commodity applications. These polymers have amide and ester groups on their chemical structure which give good thermal and mechanical properties. Polyesteramides are polymers with hydrolysable backbones which able to biodegrade under particular conditions. Strong hydrogen bonding interactions between amide groups back up some typical weakness of aliphatic polyester.
Once these polymers are formed, they are transformed into plastics by a number of methods. Plastics can be basically divided into two types - thermoplastics and thermosetting plastics. Thermoplastics are plastics that do not change their chemical composition and hence can revert to their original composition when subjected to certain external factors such as heat, acid content etc. thermosetting plastics are plastics that cannot revert to their
Lighter Weight: Plastics naturally weigh less than metals of comparable proportions. Chemical Resistance: Plastics are generally less vulnerable to damage from chemicals or chemical reactions, such as corrosion or rusting, than metals. Limited Wear Resistance: Plastic has a low resistance threshold for high temperatures, and other corrosive essentials. Structural Weaknesses: The majority plastics are unsuited for applications requiring high structural strength, such as heavy tools components and most building materials. Typical uses of Plastic made Products and Major Industries in Which Plastic Fabrication Process is used?
1. INTRODUCTION Plastics are manmade molecule of long chain polymer. Substitution of natural material by synthetic polymers started more than half a century ago and the plastic became an indispensable part of life. (1) Stability strength and durability are the main features of plastics which impress all the mankind. With time these features are improved.
It represents up to 65% of the synthetic material produced and they are mainly used for manufacturing bags, bottles, disposable containers. If such polymers reach the water bodies, due to their low density they tend to remain on the surface of the water which can be derived from its basic source such as coal, natural gas and oil. The drastic increases in the use of polyethylene materials have not been accompanied by a corresponding development of methods for the safe disposal of the plastics or degradation of these materials. Hence, such kinds of polymers are seen as environmental threat because they are difficult to degrade, (Mukherjee and Chatterjee, 2014). To be as thorough as possible, the two most widely used plastics in production were focused upon: High and Low density polyethylene.
Investigating how the composition and the structure affect the parent material of polymers: We are using Plastics widely everywhere and so many types of plastics we have. The additives change the structure and the composition of the polymer. Plastic is a polymer we use plastics everywhere soft plastic is used as covers and hard plastic is used as tables in our daily life without plastics we can’t live. Additives are needed for plastics because additives make plastics safer, tougher, colourful and cleaner plastics can be made. They reduce manufacturing cost will be reduced and the product lives longer.
• Research on polymers and plastic • Research about statistics of plastic usage Findings Plastic is a material consisting of any of a wide range of synthetic or semi-synthetic organics that are malleable and can be moulded into solid objects of diverse shapes. Plastics are typically organic polymers of high molecular mass, but they often contain other substances. A polymer is a large molecule, or macromolecule, composed of many repeated subunits. Due to their broad range of properties, both synthetic and natural polymers play an essential and universal role in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function.
They are persistent and it is known that the parts of them that degrade threaten ecosystem with chemical residue and consumable fragments. As plastics are disposed of they are ultimately deposited in terrestrial and marine environments, while not being completely degraded. Damage is done by their leftover fragments, as they interfere with and jeopardize marine life. The chemicals released by plastics