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[求助]
PDI越小越好,還是接近1好
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| 如果PDI=重均分子量/數(shù)均分子量,那就應(yīng)該是越接近一分子量越均一,可是看文獻(xiàn)好多都是小于一的,而且還是越小越好。還有就是想知道 “ 重均分子量/數(shù)均分子量”這個比值是不是應(yīng)該大于一啊,怎么會小于一呢?請給位幫幫忙啊,我真的想不明白,先謝謝了~ |
新技術(shù) | 動態(tài)光散射 | DLS問題集 |
銀蟲 (初入文壇)
鐵蟲 (小有名氣)
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wikipedia: In organic chemistry, the polydispersity index (PDI), is a measure of the distribution of molecular mass in a given polymer sample. The PDI calculated is the weight average molecular weight divided by the number average molecular weight. It indicates the distribution of individual molecular masses in a batch of polymers. The PDI has a value equal to or greater than 1, but as the polymer chains approach uniform chain length, the PDI approaches unity (1). 從數(shù)學(xué)角度看大于等于1. |

木蟲之王 (知名作家)
木蟲之王 (文學(xué)泰斗)
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