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Controlled Digital Lending (CDL) became a popular term in the United States of America (USA) libraries as a result of a white paper authored by Kyle K. Courtney (Harvard University) and David Hansen (Duke University). (Citation?) The white paper gave the legal groundwork to explore the copyright aspect of CDL: Fair Use, First Sale Doctrine and Supreme Court rulings. The white paper also provided guidelines for Library professionals implementing this new technology to fulfill their users’ needs. Inspired by the recent CDL guidelines developed by Courtney and Hansen (2018) two librarians from the University of Florida (UF), and Florida Gulf Coast University (FGCU) started a conversation about how to develop strategies to make CDL work possible at each institution. The authors share their stories of piloting and initiating a CDL program to ensure students have reliable, affordable access to course materials they need to be successful. Additionally, the authors discuss the emerging trends of CDL in the USA, and the development of the CDL platforms, policies and implementation plans. Most importantly, the implementation of these programs presents challenges, lessons learned, and plans to sustain the program in the future.

Biodegradable polymer materials, such as polylactide and polycarbonate, have been used in packaging materials and biomedicine, etc . However, these homopolymeric materials are limited in the practical applications due to the influence of chain structures. Synthesizing block polymers with designed polymer segments is a method to optimize material properties, which has many advantages including uniform components and controllable properties. This review outlined the research progress in the perparation of block polyesers from cyclic esters, epoxides and CO2 (or cyclic anhydrides). We introduced the chain growth mechanism and the methods of judging block copolymer structures. The relationship between catalytic systems-polymer structures, and materials’ properties were further discussed.

Using adamantane-1,3-diamine and 3,5-di-tert-butylsalicylic aldehyde as raw materials, the generated salen aluminum complex was characterized by 1H, 13C NMR spectroscopy and elemental analysis. After isopropyl alcohol activation treatment, the complex has good activity (70.3-95.6%), which can provide poly(D,L-lactide) with a Pm of 0.87 for rac-lactide.