One of the following statements about fiber reinforced polymers is more accurate than the others. Answers A - D The strength of the composite in a given direction is influenced by the orientation of fibers The fibers will be more flexible than the matrix The matrix will be stronger compared to the fibers Short fiber composites have better strength and stiffness than continuous fiber compos

One of the following statements about fiber reinforced polymers is more accurate than the others. Answers A - D The strength of the composite in a given direction is influenced by the orientation of fibers The fibers will be more flexible than the matrix The matrix will be stronger compared to the fibers Short fiber composites have better strength and stiffness than continuous fiber compos

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter7: Components Of Optical Instruments

Section: Chapter Questions

Problem 7.14QAP

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Polymeric composite materials can be obtained by adding fillers in the form of particles or fibers in a polymeric matrix and are intended to form a new material with properties different from those of pure components. Regarding polymeric composites, review the statements below and check which is true and which is false. (I) The mechanical properties of a fiber reinforced polymer composite are not influenced by fiber length. (II) Composites with unidirectional continuous fibers have isotropic mechanical properties. (III) The interfacial adhesion between matrix and dispersed phase does not influence the magnitude of the final mechanical properties of the composite. (IV) In polymeric composites, fibers are normally less ductile than polymeric matrices. (V) The specific area of a material at the nanoscale is significantly less than the specific area of the same material at the microscale.
1. (a)Differentiate polypropylene and Polyurethane in term of(i)molecular structure(ii)behaviour upon heating(iii)classifification or type of polymer(iv)based on their structure, draw the stress-strain curve of both polymer.(b) Composites can be used in many applications such as sport equipment, automotive industry and Oil and gas industry.(i)Suggest one composites materials and parts/component used in these applications.(ii)Why the composite material is used for those parts as stated your answered above
rubber has lower crosslinking density than general thermoset such as epoxy materials True or False
Show the universal recycling codes to the learners. Or hang a poster of the codes in the classroom for the learners to examine. Ask the learners to bring a plastic product with any of the recycling code listed below. Ask them to describe the material: 1. What is the sample polymer material used for? 2. What recycling code is printed on the sample? 3. Describe the material in terms of hardness and/or flexibility. 4. Why are recycling codes used in the plastic materials?
As the area under the stress-strain curve decreases, the toughness___________. Decreases Increases Stays the same Cannot be evaluated
What aspect of thermoset polymers can be controlled to increase strength?
Which of the following processing methods would you use for compounding a polymer with colorants andstabilizers a) injection moulding b) thermoforming c) single-screw extrusion d) twin-screw extrusion e) transfer moulding
Compare the mechanical and thermal properties and costs of PET and poly(trimethylene terephthalate) (PTT). (a) Can PTT be used as a substitute for PET in engineering thermoplastic applications? Please give a clear answer not too long. Thank you
Question No. 3 a) Calculate the degree of Polymerization when an average molecular weight of a Polymer is 23040g/mol, having monomer of C8H8O4. b) Calculate the Degree of Crystallinity of the composite having mineral particles of 15(%) by weighthas enthalpy of melting of 31.3 (J/g) and enthalpy of crystallization of 24.4 (J/g). if, Δhm100 = 90(J/g). The Specific gravity of the matrix and particles is 1.24 and 2.2 respectively.
Crud Chemicals is producing a casting resin that can be made using either (i) AA and BB monomers or (ii) an AB-type monomer {A & B represent different functional groups, like alcohol and carboxylic acids). A catalyst is added to promote polymerization in the mold. The material has many useful properties, but is deficient in heat and solvent resistance. A proposal is made to improve heat and solvent resistance by adding a tetrafunctional monomer (A4) to the mix to provide crosslinks. Unfortunately, no one in-house knows if this will work, or if the added A4 will form a gel, so they call you in as a consultant. Evaluate their idea to use A4 as a crosslinking agent for both types of polymerizations (i and ii).
2. (d) Describe three of the functions of the matrix in fibrereinforced composites. (e) With the aid of sketches compare and contrast the fatigue fracture appearance between an alloy that failed at a low fatigue load and one that failed at a high fatigue load. (f) Propose and briefly describe one non-destructive method that can be used to detect small cracks on the surface of a metallic alloy .
In simple words, describe the following steps in fabricating an IC: a- Crystal growth; b- Epitaxial layer growth; c- Oxidation d- Photo-masking, Photolithography and Photo etching e- Diffusion: Isolation diffusion; Base diffusion; and Emitter diffusion. f- Metallization & interconnections; g- Scribing & Mounting and h- Packaging and Quality Control.

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