| 摘要 |
<p>A polymer comprising one or more optionally substituted repeat units of formula (I): (I) wherein each Ar1 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; each Ar2 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; n and m in each occurrence is at least 1; and R1 and R2 are substituents wherein R1 and R2 are different.</p> |
