It was found that introduction of hydrophobic monomer into polymer chain improved the response linearity and sensitivity , and the impedance of sensors decreased with longer quaternization time and shorter distance between electrode tracks 發(fā)現(xiàn):疏水性單元的引入,提高了濕敏元件的響應(yīng)線性度和靈敏度;季胺化時間的延長,使聚合物季胺化程度提高,濕敏元件阻抗減??;電極叉指間距增大,阻抗增大。
Pdmaema can be cross - linked by quaternization to develop a positively charged dense network structure . according this mechanism , pdmaema / psf positively charged nanofiltration membrane was developed by interfacial polymerization using psf plate macrofiltration membrane as support layer , pre - polymer of pdmaema water solution as coating solution , p - xylylene dichloride / heptane as cross - linking agent 根據(jù)這一機理,以psf平板微孔膜為基膜, pdmaema預(yù)聚物水溶液為涂層液,以對二氯芐正庚烷溶液為交聯(lián)劑,采用界面聚合法制備了pdmaema psf荷正電復(fù)合納濾膜。
Simultaneously cross - linked and quaternized 4 - vp - co - nbuma was also investigated as humidity sensing materials and showed good linearity , high sensitivity , good high stability at high humidity and high temperature , and durability to organic solvent , etc . sensors based on 4vp - co - buma ( vp / buma = l / l ) with crosslinking and quaternization reaction of 17 hours exhibited a change of three orders of magnitude ( 104 ~ 107 ) in impedance over the range of 95 % rh ~ 30 % rh , showing high sensitivity , and little hysteresis was observed 元件具有響應(yīng)線性度好,靈敏度高,濕滯小、高溫高濕穩(wěn)定性好、耐無水乙醇有機溶劑性能好等優(yōu)點。其中,交聯(lián)季胺化17小時配料比為1 1共聚物濕敏元件,在33 rh 95 rh濕度范圍內(nèi),阻抗變化達3個數(shù)量級( 10 ~ 7 - 10 ~ 4 ) ,響應(yīng)靈敏度高,幾乎無濕滯。