当前位置：
X-MOL 学术
›
Biomacromolecules
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Shear-Dependent Structures of Flocculated Micro/Nanofibrillated Cellulose (MNFC) in Aqueous Suspensions.
Biomacromolecules ( IF 5.5 ) Pub Date : 2020-07-20 , DOI: 10.1021/acs.biomac.0c00586 Emily G Facchine , Richard J Spontak , Orlando J Rojas 1 , Saad A Khan
Biomacromolecules ( IF 5.5 ) Pub Date : 2020-07-20 , DOI: 10.1021/acs.biomac.0c00586 Emily G Facchine , Richard J Spontak , Orlando J Rojas 1 , Saad A Khan
Affiliation
|
Cellulosic nanomaterials constitute a topic of growing commercial interest for numerous applications, many of which demand a working knowledge of the rheology of the materials. We demonstrate here that aqueous suspensions of micro/nanofibrillated cellulose (MNFC) exhibit complex shear behavior governed primarily by fibrillar floc dynamics. Regimes corresponding to structure formation, persistence, and breakdown are quantitatively differentiated. We assess the recovery of the network structure as a function of the applied breakdown conditions and identify critical conditions that characterize the floc dynamics as isotropic or anisotropic. A two-step yield behavior generates persistent anisotropic flocs that effectively prohibit recovery of the initial gel structure under certain conditions. Processing within this stress window entails a risk of generating heterogeneous, potentially irreproducible structures and properties. An in-depth understanding of the rheology of aqueous MNFC suspensions and their floc-dominated, rather than fibril-dominated, nature is critical to rationally tailoring properties through judicious selection of processing conditions.
中文翻译：
悬浮液中絮凝的微/纳米原纤化纤维素（MNFC）的剪切相关结构。
纤维素纳米材料构成了许多应用中日益增长的商业兴趣的主题，其中许多要求对材料的流变学有所了解。我们在这里证明，微/纳米纤维化纤维素（MNFC）的水悬浮液表现出主要由原纤维絮凝动力学控制的复杂剪切行为。对应于结构形成，持久性和崩溃的制度在数量上有所区别。我们根据所应用的击穿条件评估网络结构的恢复，并确定将絮凝动力学表征为各向同性或各向异性的关键条件。两步屈服行为产生持久的各向异性絮凝物，该絮凝物在某些条件下有效地阻止了初始凝胶结构的恢复。在此应力窗口内进行加工会产生产生异质，潜在不可复制的结构和特性的风险。深入了解水性MNFC悬浮液的流变学及其絮凝物为主而不是原纤维为主的性质，对于通过明智地选择加工条件合理地调整性能至关重要。
更新日期：2020-09-14
中文翻译：
悬浮液中絮凝的微/纳米原纤化纤维素（MNFC）的剪切相关结构。
纤维素纳米材料构成了许多应用中日益增长的商业兴趣的主题，其中许多要求对材料的流变学有所了解。我们在这里证明，微/纳米纤维化纤维素（MNFC）的水悬浮液表现出主要由原纤维絮凝动力学控制的复杂剪切行为。对应于结构形成，持久性和崩溃的制度在数量上有所区别。我们根据所应用的击穿条件评估网络结构的恢复，并确定将絮凝动力学表征为各向同性或各向异性的关键条件。两步屈服行为产生持久的各向异性絮凝物，该絮凝物在某些条件下有效地阻止了初始凝胶结构的恢复。在此应力窗口内进行加工会产生产生异质，潜在不可复制的结构和特性的风险。深入了解水性MNFC悬浮液的流变学及其絮凝物为主而不是原纤维为主的性质，对于通过明智地选择加工条件合理地调整性能至关重要。
京公网安备 11010802027423号