聚酰亚胺是一类应用广泛的特种工程材料。某聚酰亚胺的合成路线如下：已知：Ⅰ Ⅱ．Ⅲ．ch3cooh Ch3cooh R代表烃基请回答下列

聚酰亚胺是一类应用广泛的特种工程材料。某聚酰亚胺的合成路线如下：已知：Ⅰ Ⅱ．Ⅲ．ch3cooh Ch3cooh R代表烃基请回答下列
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