Thermoset polymers are generally characterized as ________ polymers Cross-linked Thermoplastic Recyclable Heavy All these choices

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

Why are some polymers hygroscopic? How are the mechanical properties affected bymoisture, explain by giving specific examples of polymers and mechanical properties.

what are the advantages and disadvantages of making a leaf-spring for a commercial vehicle using pultruded Kevlar-fibre reinforced polyester resin?  please do not answer with short sentences, I am looking for more in depth and academic answer.  can you please mention the references

Given the table below and your judgement for extreme operational conditions, select polymers for the following applications respectively: a dry ice bucket (operating temperature of -78C), a teeth aligner, a hair dryer (operating temperature range of 60-80C) and a phone case. Table 15.2 Melting and Glass Transition Temperatures for Some of the More Common Polymeric Materials Material Polyethylene (low density) Polytetrafluoroethylene Polyethylene (high density) Polypropylene Nylon 6,6 Polyester (PET) Poly(vinyl chloride) Polystyrene Polycarbonate U Glass Transition Temperature [°C (°F)] -110 (-165) -97 (-140) -90 (-130) -18 (0) 57 (135) 69 (155) 87 (190) 100 (212) 150 (300) a. b. c. Nylon, PET, HDPE, PVC Dd. HDP , LDPE, LDPE, PTFE e. LDPE, PTFE, Nylon, polypropylene Melting Temperature [°C (°F)] 115 (240) 327 (620) 137 (279) 175 (347) 265 (510) 265 (510) 212 (415) 240 (465) 265 (510) PTFE, HDPE, HDPE, polypropylene Polypropylene, PET, PTFE, Polypropylene

Other than wood nonferrous engineering materials can be divided into four categories they are polymers elastomers ceramics and glass and composites. True or false.

The answer is one of the options below please solve carefully and circle the correct option Please write clear .

Reaction injection molding is used for which one of the following plastic types: thermoplastics thermosets

Questions d-f

Hello. I am having trouble with one of the questions I have for my study guide for Material Science. I will list the question down below. Thanks. What are two differences between thermoplastic and thermosetting polymers?