_____________ is not a polyester fiber?
_____________ is not a polyester fiber?
A. Terylene
B. Dacron
C. Nylon
D. Polyacrylonitrile
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Zeigler – Natta catalyst (AlR3 – AlCl3) is used in the polymerisation of_________________?
Zeigler – Natta catalyst (AlR3 – AlCl3) is used in the polymerisation of_________________?A. Vinyl acetate
B. Vinyl chloride
C. Propylene
D. Styrene_______________ is normally used for the manufacture of refrigerator components and transistor parts?
_______________ is normally used for the manufacture of refrigerator components and transistor parts?A. Polypropylene
B. Polystyrene
C. Polyester
D. PolyurethaneThe generic chemical name for the class of polymers which are commercially known as nylons is______________________?
The generic chemical name for the class of polymers which are commercially known as nylons is______________________?A. Polyolefins
B. Polyamide
C. Polyacrylate
D. PolyurethanePolystyrene is a ____________ plastic at room temperature?
Polystyrene is a ____________ plastic at room temperature?A. Ductile
B. Brittle
C. Malleable
D. None of thesePlasticisers are added to synthetic plastics to ________________?
Plasticisers are added to synthetic plastics to ________________?A. Impart flexibility
B. Improve workability during fabrication
C. Develop new improved properties not present in the original resin
D. All A., B. and C.Epoxy resins (i.e., epoxide polymers) ?
Epoxy resins (i.e., epoxide polymers) ?A. Are made by addition polymerisation reaction only
B. Contain an epoxy group (fig bellow) at the ends of the polymer
C. Are cross-linked polymers only
D. Use emulsion polymerisation methods