Professor Pei was a nice guy, but a terrible lecturer. He went quite fast during class and spoke quietly, so if you wanted to get anything from his class, you needed to go to sit towards the front. Lectures were long and boring and his mellow voice made it difficult to stay awake. But if you ask him questions, he is quite helpful and can clear up concepts well. He might not be a good lecturer, but he knows his stuff and can answer any question you might have. His midterms were not overly difficult and were largely based on the slides, but there are usually one or two questions on there that aren't straight from the slides and were quite difficult. The book was awful. I have no words for how bad the textbook was - it not only glossed over difficult concepts by saying "I think that's enough, you get the point of chain transfer", but it also tried way too hard to relate to us and fell flat on its face. A better name for the textbook would be "Essentials of Trying to Relate to College Students but Can't". That being said, the textbook can be good for reinforcing concepts, but definitely not for learning them. The final was difficult as it was mostly based on electrical properties, which he rushed through in the final two lectures (he struggles to stay on schedule). The selling point for this class is that his curve is relatively generous (I believe he curves to a high B).

Pei was not terrible, but I would not recommend this class unless you have a particular interest in polymers. The material is very dry and the exams are tough, focusing mainly on memorizing facts and trivia rather than applying methodology.

Very dry lectures, overly detailed tests. Did not learn much. Would not recommend.

Very helpful teacher. I fell asleep a few times in class because it's a 4pm class and I'm exhausted from 8am to 1pm class mondays and wednesdays and Professor Pei has a soothing voice . However, Prof. Pei is a clear lecturer, makes concise slides, and very friendly. I would recommend him as an excellent professor. I just wish his class was in the morning. One suggestion if Prof. Pei happens to read this is to have a suggested supplemental textbook/readings that go a little beyond the textbook. The textbook is accessible to all engineering majors and covers good foundation. A book that goes a bit beyond the scope of the class would be a nice addition.

Overall, great professor!

Outside the class, he is a friendly and nice prof. My suggestion is to sit in the front for every lecture time, since he speaks softly and it's easier to read his writings. Other than that, I think he is not a very effective lecturer. You have to memorize every single thing in his lecture notes. If you are not a person who likes memorizing, dont take this class.