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Exercises
1. What is the difference between thermoplastics and thermosets?
2. Consider three samples of polyisobutylene. All molecules in sample A have a molecular weight of 30，000g/mol，all those in B have a molecular weight of 70，000g/mol，and those in C have a molecular weight of 100，000g/mol. If 10g of A are mixed with 5g of B and 1g of C，calculate Mw and Mn.
References
ALLCOCK H R，LAMPE F W，MARK J E. Contemporary Polymer Chemistry [M]. 3rd ed. Beijing: Science Press and Person Education North Asia Limited，2003.