Effects of shear on epitaxial crystallization of poly(ε-caprolactone) on reduced graphene oxide.
Effects of shear on epitaxial crystallization of poly(ε-caprolactone) on reduced graphene oxide.
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剪切对还原氧化石墨烯上聚己内酯外延结晶的影响
DOI：
10.1039/c7ra13442h
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发表时间：
2018-02-06
期刊：
影响因子：
3.9
通讯作者：
Wang, Zongbao
中科院分区：
文献类型：
--
作者：
Wu, Feng;Jiang, Libin;Miao, Weijun;Duan, Tianchen;An, Minfang;Tian, Feng;Wang, Zongbao
研究了聚ε-己内酯（PCL）在还原氧化石墨烯（RGO）上的外延结晶，剪切速率分别为3 s−1和75 s−1，剪切温度分别为65℃、70℃和75℃。二维广角x射线衍射（2D WAXD）结果表明，剪切后的PCL/RGO纳米复合材料的结晶度和（110）面取向度均高于未剪切的PCL/RGO纳米复合材料，但施加剪切场对PCL基体的晶体结构没有明显影响。二维小角x射线散射（2D SAXS）结果表明，施加剪切场使PCL链在氧化石墨烯表面外延结晶，形成更厚的片层。因此，差示扫描量热（DSC）结果表明，剪切后的PCL/RGO纳米复合材料的熔点高于未剪切时的熔点。这些结果表明，施加剪切场可以增强PCL基体的取向，促进PCL链在RGO表面的外延结晶。较高的剪切温度是PCL链在低剪切速率下在还原氧化石墨烯上良好外延结晶的要求，而对于高剪切速率下的样品则不需要。研究了聚ε-己内酯（PCL）在还原氧化石墨烯（RGO）上的外延结晶，剪切速率分别为3 s−1和75 s−1，剪切温度分别为65℃、70℃和75℃。
Epitaxial crystallization of poly(ε-caprolactone) (PCL) on reduced graphene oxide (RGO) was investigated by shearing at different shear rates of 3 s−1 and 75 s−1 and different shear temperatures of 65 °C, 70 °C and 75 °C, respectively. Two dimensional wide angle X-ray diffraction (2D WAXD) results show that the crystallinity and the orientation degrees of the (110) plane of PCL/RGO nanocomposites with shear are higher than those without shear, but the imposed shear field has no obvious effect on the crystal structure of the PCL matrix. Two dimensional small angle X-ray scattering (2D SAXS) results suggest that the imposed shear field makes PCL chains epitaxially crystallize on RGO surfaces to form thicker lamellae. Thereby the melt points of PCL/RGO nanocomposites with shear are higher than that without shear from the differential scanning calorimetry (DSC) results. These results indicate that the imposed shear field can enhance the orientation of the PCL matrix, and promote epitaxial crystallization of PCL chains on RGO surfaces. Higher shear temperature is the requirement for PCL chains to epitaxially crystallize well on RGO at low shear rate, although it is not required for the samples at high shear rate. Epitaxial crystallization of poly(ε-caprolactone) (PCL) on reduced graphene oxide (RGO) was investigated by shearing at different shear rates of 3 s−1 and 75 s−1 and different shear temperatures of 65 °C, 70 °C and 75 °C, respectively.
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影响因子：
15
作者：
Niyogi, Sandip;Bekyarova, Elena;Haddon, Robert C.
通讯作者：
Haddon, Robert C.
DOI：
10.1016/0168-9002(94)90720-x
发表时间：
1994-07-15
影响因子：
1.4
作者：
HAMMERSLEY, AP;SVENSSON, SO;THOMPSON, A
通讯作者：
THOMPSON, A
影响因子：
4.6
作者：
Na, B;Zhang, Q;Shen, KZ
通讯作者：
Shen, KZ
影响因子：
2.4
作者：
PETERMANN, J;XU, Y
通讯作者：
XU, Y
影响因子：
4.2
作者：
Jing, Xiangjin;Qiu, Zhaobin
通讯作者：
Qiu, Zhaobin