Flashcards
Plastic
Cards in this deck (12)
- 1What are the forms of raw materials for processing plastics into products?Pellets, granules, powders or liquid, paste
- 2Apa itu elastomerelastomer adalah salah satu jenis polimer yang memiliki perilaku khas yaitu memiliki daerah elastis non-linear yag sangat besar. Perilaku tersebut ada kaitannya dengan struktur molekul karet yang memiliki ikatan silang (cross link) antar rantai molekul. Ikatan silang ini berfungsi sebagai ‘pengingat bentuk’ (shape memory) sehingga karet dapat kembali ke bentuk dan dimensi asalnya pada saat mengalami deformasi dalam jumlah yang sangat besar (hingga 800%)
- 3Describe the advantages of cold-forming plastics over other plastic-processing methodsOne of the advantages of cold-forming plastics versus other processing methods is that its toughness, strength, and uniform elongation improve.
- 4The lowest cost reinforcing fiberGlass
- 5Sebutkan jenis-jenis reinforcing fibersglass,carbon,aramid(kevlar),nilon,boron, nylon, silicon carbide, silicon nitride, aluminum oxide, boron carbide, boron nitride, tantalum carbide, steel, tungsten,
molybdenum - 6Describe the functions of the matrix and the reinforcing fiberssupport and protect fibers matrix of material
- 7The highest strength reinforcing glass fibers and also the highest costS-type
- 8What similarities and differences are there between compression molding and closed-die forging?
- 9If a polymer is in the form of a thin sheet, is it a thermoplastic or thermoset? Why?It is a thermoplastic. The high strain-rate sensitivity of thermoplastic allows extensive stretching in forming operations and a polymer in the form a thin sheet are mostly thermoplastics
- 10Explain why injection molding is capable of producing parts with complex shapes and fine detailThe reason is mainly due to the attractive features of thermoplastics. When melted, they are a viscous liquid that can flow into intricate cavities under pressure, and then cool and solidify in the desired shape
- 11Elastomers and thermosetting polymers are both cross-linked. Why are their properties so different?Elastomers are lightly cross-linked, whereas thermosets are highly cross-linked. Light cross-linking allows extensibility; a highly cross-linked structure makes the polymer rigid.
- 12Jelaskan apa itu thermosettingcannottoler-aterepeatedheatingcyclesasthermoplasticscan.Wheninitiallyheated,theysoftenandflowformolding,buttheelevatedtemperaturesalsoproduceachemicalreaction
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- PROSMAN II Flashcards on Plastic, created by Kalolo 34 on 01/09/2017.
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- Kalolo 34
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