親電子基團 的英文怎麼說
中文拼音 [qīndiànzijītuán]
親電子基團
英文
electrophilic group-
Silylate - terminated polyurethanes with built - in hydrophilic sites were synthesized. when the polymer is dispersed in water, the silane alkoxy end - groups of the polymer undergo hydrolysis, followed by condensation to form a stable cross - linked aqueous dispersion. tem studies indicated that with more incorporation of hydrophilic sites, the particle size of the dispersion decreased. it was also found that the film property depended on the particle size when the crosslinking density in particels was much higher. the average molecular weight of the elastically effective network chain mc measured by swelling experiments shows fairly good agreement with the theoretical value of mc. it was also found that the cross - linking density of the casting film may increase during the film formation and drying process
將硅氧烷封端的含親水基團的線性聚氨酯預聚體分散於水中，獲得穩定的聚氨酯分散體.由於硅氧基團水解、縮合，在分散體粒子內產生擴鏈交聯反應，生成了交聯水基聚氨酯分散體.透射電子顯微鏡研究表明分散體粒徑小、分佈寬.掃描電子顯微鏡研究了成膜結構及成膜性能與粒徑的關系.溶脹實驗計算獲得的兩交聯點之間的平均分子量與理論平均分子量相符.研究還發現此分散體膜在乾燥過程中可進一步交聯.膜的水溶脹及機械性能表明，此分散體具有極大的工業應用價值However, fc derivatives could not be used as functional molecules directly in many high - tech fields such as nonlinear optics, light emitting devices, sensors and so on. only when they are organized with some structure or dispersed homogeneously into solid matrix to form functional material, their function could be fully brought into play
在許多領域，如非線性光學、發光器件、傳感器等，二茂鐵衍生物並不能直接應用，但將具有光電活性的二茂鐵基團引入到兩親分子中，形成特定性能的成膜分子，就能真正發揮其作用。
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