Page 58 - 《精细化工》2022年第6期
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·1124·                            精细化工   FINE CHEMICALS                                 第 39 卷

            到疏水处理后气凝胶复合相变材料的表面,水滴可                             孔结构紧凑,而且导热系数较低〔0.0487 W/(m·K)〕,
            以长时间保持其圆形形状,其接触角约为 140.2°。                         具备良好的隔热性能。
            PDMS 是一种以硅氧键为骨架的高分子有机硅化合                              (2)DCMC 作为生物大分子交联剂有效改善了
            物,由于其主链十分柔顺,分子间的作用力弱,所                             胶原气凝胶的力学性能。当 DCMC 用量小于 15%时,
            以表面张力小,表面能低,具有很好的疏水性                      [27] 。   改性胶原气凝胶的压缩应力随 DCMC 用量的增加
            经 PDMS 处理后,DCMC 改性胶原气凝胶复合相变                        而变大,然而当 DCMC 含量大于 15%后,改性胶原
            材料表面构筑了一层低表面能涂层,使其由亲水性                             气凝胶的压缩应力显著变小。
            变为疏水性。                                                (3)通过真空浸渍法填充相变材料和浸涂法疏
                 本研究使用泥土作为污垢,将泥土撒在 DCMC                        水处理制备出 DCMC 改性胶原气凝胶复合相变材
            改性胶原气凝胶复合相变材料的表面,以约 30°的                           料,具有储能调温特性,可进一步减缓热量扩散,
            角度放置载玻片,然后用水冲刷表面污垢,结果如                             提高其隔热性能。通过 PDMS 疏水处理可提高
            图 12 所示。                                           DCMC 改性胶原气凝胶复合相变材料的防泄漏能
                                                               力,还赋予其优良的防污性能。

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            复合相变材料耐水性差的缺陷,增强在潮湿环境下                             [9]   DHARUNYA G, DURAIPANDY  N,  LAKRA R,  et al. Curcumin
            的形状稳定性,使其长时间在潮湿的户外依旧拥有                                 cross-linked collagen aerogels with controlled anti-proteolytic and
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            通过冷冻干燥法制备了 DCMC 改性胶原气凝胶。                           [12]  JIANG X L, YANG Z, PENG Y F, et al. Preparation, characterization
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            DCMC 用量对改性胶原气凝胶的密度、孔隙率和形                               crosslinking reagent[J]. Carbohydrate Polymers, 2016, 137: 632-641.
            貌有较大影响。引入 DCMC 后可以形成席夫碱交联                          [13]  TAN H, WU B, LI C P, et al. Collagen cryogel cross-linked by naturally
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                              3
            (9.21~10.38 mg/cm )、孔隙率高(94.99%~97.05%)、                                         (下转第 1133 页)
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