No abstract

We discuss the proof of concept that gives mobile robotic units the ability to provide a mobile wireless mesh network providing wireless service to end-clients and also demonstrate the ability to increase the throughput of this mobile wireless mesh system by autonomously reducing the hop count required for network traffic to transit through. In doing so, this proof-of-concept contributes to future development of a robust system which can be deployed and utilized in different situations and industry.

We have examined the polymerization of certain multi(meth)acrylates using solid state 13 C NMR spectroscopy. A quantitative single pulse method with gated decoupling was used to determine the number of unreacted double bonds in the polymer network. The heat of polymerization for the (meth)acrylate double bonds was verified using a combination of NMR spectroscopy and differential scanning photocalorimetry (DPC) experiments. The NMR method was also used to monitor the effects of aging or thermal cycling in these networks.Crosslinked polymer networks formed from multifunctional acrylates are completely insoluble. Consequently, solid-state nuclear magnetic resonance (NMR) spectroscopy becomes an attractive method to determine the degree of crosslinking of such polymers (1-4). Solid-state NMR spectroscopy has been used to study the homopolymerization kinetics of various diacrylates and to distinguish between constrained and unconstrained, or unreacted double bonds in polymers (5,6). Solid-state NMR techniques can also be used to determine the domain sizes of different polymer phases and to determine the presence of microgels within a polymultiacrylate sample (7). The results of solid-state NMR experiments have also been correlated to dynamic mechanical analysis measurements of the glass transition (1,8,9) of various polydiacrylates.In the present work, we use quantitative solid-state 13 C NMR spectroscopy to study the polymerization process of multiacrylates and the effects of thermal history/aging on the free radical life in polymultiacrylates. Experimental1,1,1-Trimethylolpropane triacrylate (TrMPTrA, mw 296.3, Polysciences Inc., Warrington, PA) was mixed with 1 wt% 2,2-dimethoxy-2-phenyl-acetophenone (DMPA, mw 256.3, Aldrich Chemical Co., Milwaukee, WI) as a photoinitiator. For the photocalorimetry experiments, a quantity of approximately 2 μΐ of this mixture was transferred to a differential photocalorimeter pan (DPC, model 930, TA Instruments, Wilmington, DE), and an empty pan was used as a reference. The light intensity was

No abstract