US 11,987,677 B2
PVDF thin film having a bimodal molecular weight and high piezoelectric response
Sheng Ye, Redmond, WA (US); Hao Mei, Redmond, WA (US); Cody Wayne Weyhrich, Phoenix, AZ (US); Arman Boromand, Redmond, WA (US); Andrew John Ouderkirk, Redmond, WA (US); Christopher Yuan Ting Liao, Seattle, WA (US); Emma Rae Mullen, Seattle, WA (US); Christopher Stipe, Woodinville, WA (US); Nagi Hosni Elabbasi, Southborough, MA (US); and Rui Jian, Fremont, CA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by META PLATFORMS TECHNOLOGIES, LLC
Filed on Dec. 22, 2021, as Appl. No. 17/559,655.
Claims priority of provisional application 63/181,978, filed on Apr. 30, 2021.
Claims priority of provisional application 63/254,449, filed on Oct. 11, 2021.
Prior Publication US 2022/0348729 A1, Nov. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08L 27/16 (2006.01); C08J 5/18 (2006.01); C08L 27/14 (2006.01); C08L 27/04 (2006.01); C08L 27/12 (2006.01)
CPC C08J 5/18 (2013.01) [C08L 27/16 (2013.01); C08J 2427/16 (2013.01); C08L 27/04 (2013.01); C08L 27/12 (2013.01); C08L 27/14 (2013.01); C08L 2201/10 (2013.01); C08L 2203/16 (2013.01); C08L 2205/02 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A polymer thin film, comprising:
a crystalline polymer; and
an additive, wherein the crystalline polymer has a weight average molecular weight of at least approximately 100,000 g/mol, the additive comprises a moiety derived from a monomer selected from the group consisting of vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropylene, and vinyl fluoride and has a weight average molecular weight of less than approximately 25,000 g/mol, and the polymer thin film has an electromechanical coupling factor (k31) of at least approximately 0.1.