Which of the following are reasons why injection molding of thermosets is more difficult than injection molding of thermoplastics (two best answers): allowances must be made for cross-linking of thermosets Obarrel temperatures must be hotter for thermosets Ocycle times are longer because of curing thermosets are denser two injection units are required

Which of the following are reasons why injection molding of thermosets is more difficult than injection molding of thermoplastics (two best answers): allowances must be made for cross-linking of thermosets Obarrel temperatures must be hotter for thermosets Ocycle times are longer because of curing thermosets are denser two injection units are required

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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with the use of appropriate diagrams/ structures and examples compare and contrast thermosetting plastics and thermoplastics.
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The answer is one of the options below please solve carefully and circle the correct option Please write clear .
Molecular weight data for some polymer are tabulated here. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight. (c) If it is known that this material's degree of polymerization is 710, which one of the polymers listed in Table 14.3 is this polymer? Why? Molecular Weight Range g/mol 15,000-30,000 Xi Wi 0.04 0.01 30,000-45,000 0.07 0.04 45,000-60,000 0.16 0.11 60,000-75,000 0.26 0.24 75,000-90,000 0.24 0.27 90,000 105,000 0.12 0.16 105,000-120,000 0.08 0.12 120,000-135,000 0.03 0.05
more than one option is possible a-The window allows for oxygen molecules to flow into the resin vat from underneath in order to react with the monomer molecules and increase the polymerization and ultimately print speed b- The oxygen abundance in the proximity of the window quenches the activated molecules hence stopping any polymerization from occurring at the direct proximity of the window c-The dead zone is an unintended outcome of the oxygen permeable window that provides a nonstick surface at the cost of slowing down the print process d-The presence of oxygen in the resin environment slows down the polymerization reaction