What Is Characteristic of the Process of Step-Growth Polymerization

question 26

Multiple Choice

What is characteristic of the process of Step-Growth Polymerization?
I. In the beginning of the polymerization process, there are many oligomers (an oligomer is made from a few monomers, its chain length is short) .
II. High macromolecular weights are only reached at the very end of the polymerization process.
III. If two bifunctional monomers (e.g. diamine and dicarboxylic acid) are used, slight deviations from 1:1 stoichiometry will prevent high macromolecular weights at the end of the polymerization process.
IV. Polymer chains can grow individually to high macromolecular weight at any time during the polymerization process.

• A) I and II
• B) II and III
• C) I, II and III
• D) II and IV

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Definitions:

Variable-interval Schedule

A schedule of reinforcement where a response is rewarded after an unpredictable amount of time has passed, contributing to a steady, stable rate of response.

Specific Number

An exact quantity or value, often mentioned to denote precision or to highlight importance within a particular context.

Randomly Varying

Characterized by changes that do not follow a predictable pattern and occur in a random manner.

Reinforcement

In behaviorism, a consequence that increases the likelihood of a behavior being repeated.