The ECH polymers prepared with Al-succinimide-tetrahydrofuran catalyst system are crystalline, while those obtained with the Al-P-PT catalyst system are completely amorphous.

• 用Al-丁二酰亚胺-四氢呋喃催化体系制得者是结晶型聚合物,用Al-P-PT催化体系制得者是无定形聚合物。