Copolymers with amorphous polyamide segments

A copolymer comprising a repeat unit of formula (I) and at least one of the following additional repeat units of formulae (II and III):

• wherein:
• at least from about 20% to about 90% of the copolymer is the repeat unit of formula (I),
• by weight based on the total weight of the copolymer;
• y independently is an integer from 1 to about 200;
• Z is oxygen;
• R1 is independently at each occurrence a C6-C24 divalent organic moiety, provided that in at least 55% of the occurrences of R1, R1 is independently at each occurrence a 1-methyl-2,4-phenylene or 1-methyl-2,6-phenylene;
• R2 is independently at each occurrence a bond or C1-C14 alkylene;
• R3 is independently at each occurrence a polyoxyalkylene having a number average molecular weight (Mn) from about 400 to about 10,000;
• and
• wherein the copolymer comprises at least one amorphous polyamide segment having from 2 to about 200 repeat units of formula (I).