One of the following is incorrect, when the degree of crystalline of a polymer i

Question

One of the following is incorrect, when the degree of crystalline of a polymer increases, a. the polymer becomes denser b. the polymer becomes stronger and stiffer c. its melting temperature decreases d. its density increases Anisotropic means which one of the following? a. composite materials with compositions consisting of more than two materials, b. properties are the same in every direction c. properties vary depending on the direction in which they are measured d. strength and other properties are a function of curing temperature. A higher degree of polymerization remits. a. larger average number of mers in the molecule chain; b. higher polymer viscosity c. a and b d. none of the above Which one of the three polymer type* does not involve cross-linking: a. elastomers. b. thermoplastics c. thermosets A three-plate mold offer, which of the following advantage when compared to a two-plate mold? a. Automatic separation of parts from runners b. Gating is usually at the top of the part to reduce weld lines. c. Sprue does not solidify. d. Stronger molded parts. The principal components of an injection molding machine are which two of the following a. Clamping unit & hopper b. Hopper & mold c. Injection unit & clamping unit. d. Mold & part ejection unit

Explanation / Answer

Solution 1

When the degree of crystallinity of a polymer increase its melting temperature decreases

Solution 2

Anisotropic means which one of the following   Properties vary depending on the direction in which they are measure

Solution 3

A higher degree of polymerization results   Larger average number of mers in the molecule chain

Solution 4

Which one of the three polymers types does not involve cross linking        Thermoplastic

Solution 6 The principal components of an injection molding machine are d)Mold & part ejection unit c) injection unit and clamping unit

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