羧甲基纤维素(HPMC)，是纤维素的羧甲基团取代产物。
Carboxymethyl cellulose (HPMC), is a cellulose carboxymethyl group substituted products.
采用活性基团取代的烷氧基硅烷作为偶联剂，提高了产品对玻璃、铝等基材的粘接性能。
The use of the active group substituted alkoxy silane as a coupling agent improves the adhesion of the product to glass, aluminum and other substrates.
另外，还发现推电子基团取代的卟啉弛豫过程比吸电子基团取代的卟啉弛豫过程快7倍。
Moreover, We found that the relaxation time of H2TPP with donating electron group is about 7 times faster than that with withdrawing electron group.
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