Mechanical properties. The characterization of mechanical properties in polymers typically refers to a measure of the strength, elasticity, viscoelasticity, and anisotropy of a polymeric material.
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Which technique is used for characterization of polymers?
Generally, polymer characterization techniques are categorized as chromatographic, thermal, spectroscopic, microscopic, rheometric, or mechanical.
Why do we characterize polymer samples?
Characterization of polymers is important for when new materials are synthesized, when a competitive product is being evaluated, or when the performance of a product needs to be improved.
Why characterization in polymer is important?
Polymer characterization through gravimetric methods has an enormous range of applications. It enables highly-accurate quality control of plastic materials such as polymer thin films for packaging of fast-moving consumer goods such as pharmaceuticals and healthcare products.
What is the main characteristic of a polymer molecule?
Monomers: The simple molecules that are covalently bonded into long chains are called monomers. Long chain molecule formed from the monomer units is called a polymer. The repeat sub unit in the polymer chain is called a mer.
Which among the following is the characterization of polymer?
The answer is d) all of these. Polymers have a relative high tensile strength, i.e. polymers have very high strength-to-weight ratio, especially…
How do you analyze polymers?
Polymer molecular weight (number average) can be determined using end group analysis, which is based on a simple titration experiment. 2. The characterization of different functional groups present in a polymer sample can be performed via IR spectroscopy.
What is polymer classification?
Based on molecular forces, polymers are classified as elastomers, fibers, thermoplastics, and thermosetting polymers.
What is polymer explain?
A polymer is any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, which are multiples of simpler chemical units called monomers. Polymers make up many of the materials in living organisms and are the basis of many minerals and man-made materials.
What are the two categories of polymers?
Polymers fall into two categories: thermosetting plastic or thermoset. thermoforming plastic or thermoplastic.
What is mechanical properties of polymer?
In general, the mechanical properties of polymers can be characterized in very much the same way as in the case of metals or other standard crystalline materials, in particular through the moduli of elasticity and various other classes of strength measurements, such as the yield and tensile strengths.
Which of the following is most common method used for characterizing polymer Mcq?
Explanation: The study of fracture surfaces of polymeric material is done using scanning electron microscopy.
Which of the following is very effective technique for the study of polymer morphology?
Dynamic mechanical thermal analysis (DMTA)
What are the characteristics of polymer products?
Characteristics of Polymers
- Polymers can be very resistant to chemicals.
- Polymers can be both thermal and electrical insulators.
- Generally, polymers are very lightweight, with varying degrees of strength.
- Polymers can be processed in various ways to produce thin fibers or very intricate parts.
What are the physical characteristics of polymers?
Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on.
Which of the following is a characteristic property of polymer material?
The correct answer is High elongation.
How polymers are classified on the basis of structure?
Answer : On the basis of structure, the polymers are classified as follows :
(i) Linear polymers such as high density polythene (HDP), polyvinyl Woride, nylons, polyester, etc.
(ii) Branched polymers such as low density polythene (LDP), amylopectin, glycogen, etc.
How are polymers classified based on source?
On the basis of source polymers are classified as: Natural polymers (Example: Starch, Cellulose, Portions, etc.) Synthetic polymers (Example: PVC, -Nylon Teflon, etc.) Semi-synthetic polymers (Example.
Why do polymers have different physical properties?
Varying the molecular structure and length of polymer chains or networks results in different polymers with different properties—such as strength, flexibility, heat resistance and recyclability.
What is testing and analysis of polymer?
Polymer analysis and testing employs both physical and analytical methods to verify the chemical, mechanical, and thermal properties of a polymeric material. These properties are instrumental in making sure that the polymer part will perform as required by the end user.
Why do polymers have low fracture toughness?
The low strength of polymers compared to theoretically predicted values are mainly due to the many microscopic imperfections found in the material. These defects namely dislocations, crystalline boundaries, amorphous interlayers and block structure can all lead to the non-uniform distribution of mechanical stress.