Ionenes as Potential Phase Change Materials with Self-Healing Behavior.

Ionenes are poly(ionic liquids) (PILs) comprising a polymer backbone with ionic groups along the structure. Ionenes as solid-solid phase change materials are a recent research field, and some studies have demonstrated their potential in thermal dissipation into electronic devices. Eight ionenes obtained through Menshutkin reactions were synthesized and characterized.

Development of Novel Phase-Change Materials Derived from Methoxy Polyethylene Glycol and Aromatic Acyl Chlorides.

In this research, novel, organic, solid-liquid phase-change materials (PCMs) derived from methoxy polyethylene glycol (MPEG) and aromatic acyl chlorides (ACs) were prepared through a condensation reaction. The MPEGs were used as phase-change functional chains with different molecular weights (350, 550, 750, 2000, and 5000 g/mol). The aromatic ACs, terephthaloyl chloride (TPC) and isophthaloyl chloride (IPC), were employed as bulky linker cores.

Study of the Reaction Mechanism of Triazines and Associated Species for HS Scavenging.

Natural gas produced worldwide contains, among other compounds, HS and CO. Both gases in the presence of free water can generate problems of corrosion in pipes and subtract calorific value to this gaseous hydrocarbon. Natural gas containing HS and CO above the permissible limits should be treated to remove these components.

Novel Polyelectrolytes Obtained by Direct Alkylation and Ion Replacement of a New Aromatic Polyamide Copolymer Bearing Pyridinyl Pendant Groups.

The following work shows, for the first time, the synthesis and characterization of a new family of polyelectrolytes, along with their preliminary assessments in terms of desalin water treatment. These materials fall into the category of aromatic co-polyamides, which are obtained by the direct condensation of monomers 4,4'-oxydianiline (ODA), isophthaloyl chloride, and 3,5-diamino--(pyridin-4-ylmethyl)benzamide (PyMDA). Thereby, the charged nature exhibited by these materials was achieved through the quaternization of PyMDA moieties using linear iodoalkanes of different lengths (CI with = 1, 2, 4, and 6).

Physician Assistant Utilization Within the Orthopaedic Practice.

Orthopaedic practices and service lines increasingly are employing physician assistants (PAs). Current research, in other specialties such as primary care, demonstrates the integration of PAs has been associated with better revenue- performing practices, as well as increased patient access and satisfaction. It is important for the orthopaedic surgeon to understand the business logic and clinical experiences of integrating PAs into orthopaedic practices and service lines.