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Controlled Free-Radical Polymerization as Envisioned for PSAs With Novel Damping Properties

IP.com Disclosure Number: IPCOM000237253D
Publication Date: 2014-Jun-10
Document File: 3 page(s) / 143K

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The IP.com Prior Art Database

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Christopher L. Lester: INVENTOR

Abstract

To develop polymers with broader damping characteristics with regards to temperature and to develop a polymer with similar damping characteristics to 85EHA/15AA that has PSA characteristics.

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Title: Controlled Free-Radical Polymerization as Envisioned for

PSAs With Novel Damping Properties

Inventor: Christopher Lester

Goal:  To develop polymers with broader damping characteristics with regards to temperature and to develop a polymer with similar damping characteristics to 85EHA/15AA (composition developed in Kreuzlingen) that has PSA characteristics.

Diblocks, triblocks, multiblocks, gradients, and hyperbranched/star architectures potentially with controlled placement of functional monomers.

In order for polymers to damp a particular frequency of mechanical energy there must be a matching of that frequency by some type of molecular mobility on the polymer.  One form of molecular mobility that is well known to damp mechanical energy is long range concerted chain mobility often defined at a set frequency/temperature as the glass transition temperature in amorphous polymers.  Simply an amorphous polymer of a single Tg damps energy of a specific frequency range that may change with temperature.  It could be desirable to have polymers that can have broad damping capabilities over broad ranges of frequencies and temperatures and it would be desirable to have polymers that have high degrees of damping capabilities over one or multiples of very specific frequencies and temperatures.

Controlled free-radical polymerization techniques affords the ability to make the two scenarios described above in a way that is currently not possible with standard free-radical techniques.

Broad damping capabilities over broad ranges of frequencies and temperatures.

Multi-block type

                               

Using controlled free-radical polymerization, most preferably RAFT/SFRP techniques one can make polymers that begin as 100% of one polymer composition and then change in a stepwise fashion to other compositions through the course of polymerization (multi-blocks) with increasing amounts of another composition.

                                Eg.  100BA-block-75BA-co-25MA-block-50BA-co-50MA-block-25BA-co-75MA-

block-100MA.

                                                                Variables

                                                                                Total molecular weight

                                                                                Number of discrete blocks

                                                                                Molecular weight of discrete blocks

                                                                                Functional groups ty...