Article Ranks on the Top Ten List for EngRN: Surfaces, Coatings & Films (Topic)

As of January 18th, the article Lignocellulosic Nanofibrils as Multifunctional Component for High-Performance Packaging Applications has made the top ten list on the Social Science Research Network (SSRN) with 25 downloads in the last 60 days.

The paper can be accessed for free here.

A peer-reviewed version of this article is also published in Materials Today Communications and can be viewed here.

New Article: Insights into the Interaction between Amylose-Rich Corn Starch and Maleic Anhydride in Imidazolium Chloride-Based Ionic Liquids

A new article from Ning Yan’s lab has been published in ACS Applied Polymer Materials written by Shrestha Roy Goswami, Sen Wang and Ning Yan.

The first 50 people to click here will have access to a free e-print of the final published article until January 2024.

Abstract

Starch maleates with a high degree of maleic anhydride (MA) substitutions (DS) are in-demand for producing advanced composites. High-DS maleates are synthesized in imidazolium chloride-based ionic liquids because they could sustain starch-MA esterification, the precise mechanism of which, however, is largely unknown. In this study, we mapped chemical shifts of imidazolium cations before and after MA was added to each of the three starch-[C2mim]Cl, starch-[Amim]Cl, and starch-[C4mim]Cl systems. [C4mim]+ and [Amim]+ cations were observed to form substantial H-bonds with hydroxyls of starch. These hydroxyls could further associate with MA, liberating the bound cations. The liberated [Amim]+ cations, unlike [C4mim]+ cations, could readily donate their C2–H protons to activated MA, providing high-DS maleates (DSNMR ≈ 0.1, DStitration ≈ 1.20). The insights gained from this study would benefit the development of maleates from a wide range of biopolymers and expedite the screening of ionic liquids with varying cation–anion combinations for high-DS maleate synthesis.

New Article: Eco-friendly recyclable high performance ramie yarn reinforced polyimine vitrimer composites

A new article from Ning Yan’s lab has been published in Chemical Engineering Journal written by Pandeng Li, Cheng Hao, Huihui Wnag, Tian He, Tong Su, Cong Lo, Longjiang Yu and Ning Yan.

Click here for the article.

Abstract

The huge and increasing amount of plastic waste harms wildlife and releases chemical hazards to the environment. Using cellulosic fibers to prepare natural fiber-reinforced plastic composites (NFRPCs) is a promising strategy to decrease plastic wastes and lower their negative impacts because cellulosic fibers are renewable, degradable, and conducive to carbon neutrality. However, the low tensile strength and recycling difficulty of NFRPCs prevent them from substituting nondegradable plastics on an industrial scale. This study prepared high-performance ramie yarn-reinforced polyimine vitrimer composites (RY-PI) that could be recycled both chemically and physically. The polyimine matrix formed a robust bonding interface with ramie yarn via hydrogen bonding. The tensile strength of RY-PI (144MPa) was superior to that of most NFRPCs available in the market and was the highest amongst the NFRPCS with the same fiber fraction (wt%). RY-PI was also lightweight and had good toughness, self-healing ability, moldability, durability to organic solvents, and moisture barrier resistance. A box prepared by four-layer RY-PI laminates could support more than 3,000 times its own weight. The RY-PI was closed-loop recycled through a chemical strategy without any loss of performance. More importantly, a highly efficient (11 minutes for each recycling), low-cost, and eco-friendly (without adding any chemicals) physical recycling method of RY-PI was demonstrated. RY-PI could be physically recycled at least 9 times without any loss of performance. The high performance and good recyclability of RY-PI make it a promising environmental-friendly alternative to many conventional plastic products to help achieve zero plastic waste.