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Poly(amic acid)s (PAAs) alignment agents have been prepared from the alicyclic dianhydrides, including 1,2,3,4‐cyclobutanetetracarboxylic dianhydride (CBDA, I), 1,3‐dimethyl‐1,2,3,4‐cyclobutanetetracarboxylic dianhydride (DMCBDA, II), and ester‐linked aromatic diamines, including 4‐aminophenyl‐4′‐aminobenzoate (APAB, a) and bis(4‐aminophenyl)terephthalate (BPTP, b), respectively. The derived PAAs,...
LED with the advantages of high brightness, long-lifetime, energy-saving and environmental protection is widely used in varieties of fields especially the lighting industry. Thermal performance is the key to high power LED lighting integration, which has got broad concern and research. And the thermal management and thermal reliability has been improved quickly in recent years. While, more and more...
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