Despite the desire to produce large quantitites of AF4, known methods of making AF4 can be too expensive to be used on a commercial scale.
He deposited parylene films by the thermal decomposition of [2. The invention is limited only as defined in the following claims and the equivalents thereto.
Based on conversion of the starting material, the yield of AF4 was calculated to be about 73 mole percent. The most common parylene is parylene C one chlorine group per repeat unit, as shown above followed by parylene D two chlorine groups per repeat unit ; both chlorine groups are on the main-chain phenyl ring.
Commercialization and the SCS connection.
The method according to claim 31 wherein the reducing agent comprises a zinc powder or a synthesis powder. The method according to claim 12, wherein the reacting step includes producing the parylene AF4 in a yield of at least about 20 molar percent based on the dihalo compound used in the mixing step.
The method according to claim 22, wherein the reacting step includes producing parylene AF4 in a yield of at schools research paper about 20 molar percent based on the dihalo synthesis used in the mixing step. Preferably, the transition metal catalyst comprises less than about 0.
A few years later, William Franklin Gorham at Union Carbide proposed using the very stable dimer of the reactive p-xylylene, di-p-xylylene DPXor [2. Unexpectedly, it has been found that the use of certain metals as reducing agents results in relatively high yields of AF4. Unexpectedly, it has been found that the use of certain metals as synthesis agents results in relatively high yields of AF4.
Discussion of the Related Art Parylene is a political theory dissertation term often used to describe a synthesis of poly-p-xylenes which may be derived from a dimer of the structure: Despite the reduced cost that would result from increasing the yield of AF4, known methods of making AF4 have resulted in yields of AF4 no greater than about 40 molar percent relative to the amount of dihalo compound used in the reaction mixture.
The term "reducing agent" as used herein refers to any compound that is capable of removing the chlorine atoms from dichloride, removing the bromine atoms from dibromide or removing the iodine atoms from the diiodide. The method according to claim 1, wherein the mixing step includes mixing a reducing agent comprising a zinc powder or a magnesium powder.
In another illustrative embodiment, the present invention provides a method of making AF4. STR3 Parylene materials derived from AF4 are capable of providing thin films and conforming to substrates of varied geometric shapes, allowing for their use as conformal coatings.
The first pathway is for cyclization to occur to form AF4.
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