A novel tin-based imidazolium-modified montmorillonite catalyst for the preparation of poly(butylene terephthalate)-based nanocomposites using in situ entropically-driven ring-opening polymerization
A novel tin-based imidazolium-modified montmorillonite catalyst for the preparation of poly(butylene terephthalate)-based nanocomposites using in situ entropically-driven ring-opening polymerization
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DOI：
10.1039/c4ra12983k
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发表时间：
2015
期刊：
影响因子：
3.9
通讯作者：
L. Conzatti;R. Utzeri;P. Hodge;P. Stagnaro
中科院分区：
文献类型：
--
作者：
L. Conzatti;R. Utzeri;P. Hodge;P. Stagnaro
合成并表征了一种含2，2-二正丁基[1，3，2]二氧杂锡环戊烷结构的烷基咪唑盐。其作为酯交换催化剂在大环低聚物对苯二甲酸丁二醇酯（BT-MCO）的熵驱动开环聚合（ED-ROP）中的有效性与其他锡基酯交换催化剂相当。通过与存在于蒙脱石中的钠阳离子进行离子交换来制备负载型催化剂。X-射线分析表明，咪唑物种进入硅酸盐层之间的画廊。负载型催化剂比非负载型催化剂具有更高的热稳定性。采用原位ED-ROP法制备了聚对苯二甲酸丁二醇酯-粘土纳米复合材料，采用负载型锡基催化剂或负载型咪唑盐和二正丁基二甲氧基锡原位制备的催化剂催化BT-MCO插层于粘土层间。X-射线衍射和透射电子显微镜表明，随后的纳米复合材料表现出插层和剥离的硅酸盐纳米层的混合。
A novel alkylimidazolium salt incorporating a 2,2-di-n-butyl[1,3,2]dioxastannolane moiety was synthesized and characterized. Its effectiveness as a transesterification catalyst in the entropically-driven ring-opening polymerization (ED-ROP) of macrocyclic oligomers of butylene terephthalate (BT-MCOs) was comparable to that of other tin-based transesterification catalysts. A supported version of the catalyst was prepared by ion exchange with the sodium cations present in montmorillonite. X-Ray analysis indicated the imidazolium species entered the galleries between the silicate layers. The supported catalyst was significantly more thermally stable than the non-supported catalyst. Poly(butylene terephthalate)–clay nanocomposites were obtained by the in situ ED-ROP of BT-MCOs intercalated between the clay layers, catalyzed by either the supported tin-based catalyst or by a catalyst prepared in situ from a supported imidazolium salt with diol moieties and di-n-butyldimethoxytin. X-Ray diffraction and transmission electron microscopy indicated that the ensuing nanocomposites exhibit a mix of intercalated and exfoliated silicate nanolayers.