Nanostructured synthetic carbons obtained by pyrolysis of spherical acrylonitrile/divinylbenzene copolymers.
Nanostructured synthetic carbons obtained by pyrolysis of spherical acrylonitrile/divinylbenzene copolymers.
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DOI：
10.1371/journal.pone.0043354
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Ronka S
中科院分区：
文献类型：
--
作者：
Malik DJ;Trochimczuk AW;Ronka S
通过丙烯腈 (AN)/二乙烯基苯 (DVB) 悬浮多孔共聚物的碳化制备了新型碳材料，其标称交联度在 30-70% 范围内，并在不同量的致孔剂存在下获得。这些碳是通过 AN/DVB 共聚物在空气中于 250−350°C 下预氧化，然后在 N2 气氛中于 850°C 下热解而获得的。这两个过程均在一台熔炉中进行，所得材料无需进一步活化。所得材料通过 XPS 和低温氮气吸附/解吸进行表征。发现最大热解产率约为。 50% 取决于氧化条件，但几乎与聚合物的交联度无关。当从高度交联的聚合物或在 350°C 氧化的聚合物获得时，碳的多孔结构的特征在于存在微孔和大孔，而在所有其他情况下则存在中孔和大孔。后者的孔在由较少孔的AN/DVB树脂获得的碳的结构中占主导地位。聚合物衍生的碳的比表面积(BET)可在440平方米/克至250平方米/克之间变化，具体取决于AN/DVB聚合物前体合成中使用的致孔剂的量。
Novel carbon materials have been prepared by the carbonization of acrylonitrile (AN)/divinylbenzene (DVB) suspension porous copolymers having nominal crosslinking degrees in the range of 30–70% and obtained in the presence of various amounts of porogens. The carbons were obtained by pre-oxidation of AN/DVB copolymers at 250−350°C in air followed by pyrolysis at 850°C in an N2 atmosphere. Both processes were carried out in one furnace and the resulting material needed no further activation. Resulting materials were characterized by XPS and low temperature nitrogen adsorption/desorption. It was found that maximum pyrolysis yield was ca. 50% depending on the oxidation conditions but almost independent of the crosslinking degree of the polymers. Porous structure of the carbons was characterized for the presence of micropores and macropores, when obtained from highly crosslinked polymers or polymers oxidized at 350°C and meso- and macropores in all other cases. The latter pores are prevailing in the structure of carbons obtained from less porous AN/DVB resins. Specific surface area (BET) of polymer derived carbons can vary between 440 m2/g and 250 m2/g depending on the amount of porogen used in the synthesis of the AN/DVB polymeric precursors.
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