Phenolic resins with different molecular weight were synthesized by the adjustment of phenolic aldehyde, with p-tert-octyl phenol and formaldehyde as materials. Softening point, gel permeation chromatography and 1 H NMR Spectroscopy were used to characterize its structure. With the same molar ratio of p-tert-octyl phenol and formaldehyde, a resin with the softening point of 93.1˚C, the mean molecular weight of 1050 and relatively concentrated distribution of molecular weight was made. Results indicate that the expected molecular weight, molecular weight distribution and structure of resin can be made by the control of molar ratio of p-tert-octyl phenol and formaldehyde.
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With the large-scale application of wireless sensor network (WSN), in this application system, it is particularly important to promote the transmission real-time and achieve the remote real-time transmission of the data that the sink nodes sensor gets. This paper uses the way of the connection of the WSN based on Zigbee protocol and the Internet based on TCP/IP protocol, meanwhile introduces μC/OS-II embedded real-time operating system to manage and schedule the system resource. The experiment result shows that the design of this gateway can effectively solve the problem of data remote transmission, and also can meet the real-time requirement of the application monitoring.
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