本文選題：燃料電池　切入點(diǎn)：陰離子交換膜　出處：《高分子學(xué)報(bào)》2017年06期

【摘要】：利用4,4?-二氟二苯砜(DFDPS)、9,9?-雙(4-羥苯基)芴(BHPF)、2,2?-二(4-羥基苯基)丙烷(雙酚A)及4,4?-(六氟異丙叉)雙酚(雙酚AF)為原料,制備了2類具有不同主鏈剛性的聚醚砜材料.以聚醚砜及其氯甲基化產(chǎn)物按一定質(zhì)量比采用溶液澆鑄法,制備了2類新型共混陰離子交換膜,并避免了成膜過程中的相分離現(xiàn)象.在高分子主鏈上通過引入雙酚芴(BQPAES系列)及雙酚A(BQPES系列)結(jié)構(gòu)調(diào)整主鏈的剛性,探討了主鏈剛性對(duì)性能的影響;表征了共混膜的離子交換容量(IEC)、吸水及溶脹特性與離子電導(dǎo)率,并考察了它們的耐水解和耐堿穩(wěn)定性.結(jié)果表明:2種聚合物相容性良好,共混膜質(zhì)地均一,柔韌透明,吸水率和溶脹率適中,均隨著溫度的升高逐漸增加、隨著聚醚砜含量增加逐漸減小;在90?C時(shí),離子電導(dǎo)率最高達(dá)到89 m S/cm.經(jīng)過沸水處理24 h后,均保持高機(jī)械強(qiáng)度,失重率低于5%;經(jīng)2 mol/L的Na OH溶液30?C處理168~240 h后離子電導(dǎo)率仍可保持65%~80%.由于含雙酚芴結(jié)構(gòu)的高分子主鏈具有更高的剛性,在類似IEC條件下,BQPAES膜顯示了比BQPES膜更好的尺寸穩(wěn)定性和化學(xué)穩(wěn)定性,同時(shí)維持了較高的電導(dǎo)率水平.由此表明,復(fù)合處理及適度提高高分子主鏈的剛性,有利于提高膜的性能.
[Abstract]:Two new types of mixed anion exchange membranes were prepared by solution casting with polyethersulfone and its chloromethylation products at a certain mass ratio, and the phase separation phenomenon was avoided in the process of film formation.The influence of the rigidity of the main chain on the properties of the main chain was studied by introducing the structure of bisphenol fluorene (BQPAES series) and bisphenol A (BQPES series), and the ion exchange capacity, water absorption, swelling property and ionic conductivity of the blend membrane were characterized.Their hydrolysis resistance and alkali resistance were investigated.The results showed that the two kinds of polymers had good compatibility, uniform texture, flexibility and transparency, moderate water absorption and swelling rate, both increasing with the increase of temperature and decreasing with the increase of polyethersulfone content.The ion conductivity is up to 89ms / cm.After treatment with boiling water for 24 h, the mechanical strength was high, the weight loss rate was lower than 5, and the ionic conductivity could still be maintained at 65% after treatment with NaOH solution of 2 mol/L for 1688 ~ 240 h.Due to the higher rigidity of the main chain with diphenol-fluorene structure, the BQPAES film exhibits better dimensional and chemical stability than that of the BQPES film under similar IEC conditions, and maintains a higher conductivity level at the same time.It is shown that the composite treatment and the moderate increase of the rigidity of the main chain of the polymer are beneficial to the improvement of the performance of the membrane.
【作者單位】： 南京理工大學(xué)環(huán)境與生物工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(基金號(hào)21276128) 江蘇省自然科學(xué)基金(基金號(hào)BK20141398) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)(項(xiàng)目號(hào)30920130121014)資助
【分類號(hào)】：TM911.4;TQ425.236

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