摘要:
A star block copolymer and a thermoplastic elastomer including plurality of the star block copolymers and a method of making both is taught. The star block copolymers of the present invention include a core component having either a styrene oligomer or α-methyl styrene oligomer, wherein arms emanate from the core component and the arms are poly(isobutylene-block-styrene) diblock copolymers.
摘要:
A system and method for evaluating the interactivity of RF devices in a virtual RF environment having selective virtual spectrum users remotely controlled by a web browser, where the virtual spectrum users have selectable interactivity parameters, and the virtual RF spectrum can be selectively changed, and the performance of the virtual spectrum users is evaluated and assigned scores as a function of the evaluation to determine which virtual spectrum user receives the highest amount of points.
摘要:
A system and method for evaluating the interactivity of RF devices in a virtual RF environment having selective virtual spectrum users remotely controlled by a web browser, where the virtual spectrum users have selectable interactivity parameters, and the virtual RF spectrum can be selectively changed, and the performance of the virtual spectrum users is evaluated and assigned scores as a function of the evaluation to determine which virtual spectrum user receives the highest amount of points.
摘要:
A new methodology for the synthesis of a novel difunctional- and a known trifunctional initiator, i.e., 1,3-di(2-methoxy-2-propyl)-5-isopropyl benzene and 1,3,5-tri(2-methoxy-2-propyl)benzene, respectively, for the preparation of di- and tri-telechelic polyisobutylenes. The synthesis proceeds in three steps: 1) catalytic peroxidation of 1,3,5-triisopropylbenzene, 2) reduction of the peroxides to the corresponding alcohols, and 3) methylation of the alcohols. By controlling the conversion of the key peroxidation step the relative ratio of di- and tri-functional intermediates can be controlled. By the use of the 1,3-di(2-methoxy-2-propyl)-5-isopropyl-benzene, well-defined di-methoxy telechelic polyisobutylenes can be synthesized. Although the overall combined yield of the two initiators was only 14-20%, because of the low cost of the starting material, reagents used, and simple manipulations these compounds represent the most cost effective initiators to-date for the preparation of telechelic polyisobutylenes.
摘要:
The present invention generally relates to alcohol-terminated polyisobutylene (PIB) compounds, and to a process for making such compounds. In one embodiment, the present invention relates to primary alcohol-terminated polyisobutylene compounds, and to a process for making such compounds. In still another embodiment, the present invention relates to polyisobutylene compounds that can be used to synthesize polyurethanes, to polyurethane compounds made via the use of such polyisobutylene compounds, and to processes for making such compounds. In yet another embodiment, the present invention relates to primary alcohol-terminated polyisobutylene compounds having two or more primary alcohol termini and to a process for making such compounds. In yet another embodiment, the present invention relates to primary terminated polyisobutylene compounds having two or more primary termini selected from amine groups or methacrylate groups.
摘要:
The present invention generally relates to alcohol- and amine-terminated polyisobutylene (PIB) compounds, and to a process for making such compounds. In one embodiment, the present invention relates to primary alcohol- and amine-terminated polyisobutylene compounds, and to a process for making such compounds. In still another embodiment, the present invention relates to polyisobutylene compounds that can be used to synthesize polyurethanes and polyureas, to polyurethane and polyurea compounds made via the use of such polyisobutylene compounds, and to processes for making such compounds. In yet another embodiment, the present invention relates to polyisobutylene compounds containing urea or urethane segments therein, and to a method of producing such compounds. In still yet another embodiment, the present invention relates to a polymer having one or more different soft segments and one or more different hard segments.
摘要:
A system and method of applying a known modification in the form of a distortion to a signal to enable a determination if a signal received by a first node is received directly from a second node or indirectly through a repeater. The repeater receives a primary signal and creates a secondary signal as a function of the primary signal and a known distortion, wherein the known distortion identifies the repeater. The primary signal is transmitted and injected with the secondary signal as the first signal to the primary receiver.
摘要:
A system and method for a network analysis system operating in a wireless communication system with repeaters is disclosed. Embodiments of the system and method enable the network analysis system to determine if signals being received by the network receivers arrive directly from a target mobile appliance or if the signals are passing through a repeater. The repeaters through an augmentation measure attribute of a received signal to a network manager and based on these attributes it is determine whether the signal is served by a repeater or other network device.
摘要:
The synthetic production of cis-1,4-polyisoprene and other cis-1,4-polydienes is achieved by adding isoprene or other diene monomers to a natural rubber latex or washed rubber particles and utilizing various allylic pyrophosphate compounds. The natural rubber latex or washed rubber particles inherently contain an enzyme catalyst and desirably divalent metal cofactors therein and the polymerization can occur over a relatively wide temperature range. The process is believed to be a living carbocationic polymerization. The in vitro produced natural rubber polymers can contain from about 5 to about 30,000 repeat units and are essentially free of non-enzyme catalysts. The invention can be utilized to synthesize polyisoprenoids and precursors to form terpenes, vitamins, steroids, alkaloids, and the like.
摘要:
The present invention generally relates to pre-polymer and polymer compositions that can be photopolymerized. In one embodiment, the present invention relates to crosslinking agents that can be used in the photopolymerization of the pre-polymers and polymers disclosed herein. In another embodiment, the present invention relates to processes for producing pre-polymer, polymer and crosslinking compositions useful in photopolymerization reaction schemes. In one instance, the pre-polymers and polymers of the present invention can be crosslinked via a suitable crosslinking agent to produce networks (e.g., amphiphilic networks and/or co-networks).