公开(公告)号：US20220348730A1

公开(公告)日：2022-11-03

申请号：US17582574

申请日：2022-01-24

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Sheng Ye ,  Arman Boromand ,  Christopher Yuan Ting Liao ,  Laura Cressman ,  Emma Rae Mullen ,  Andrew John Ouderkirk ,  Hao Mei ,  Cody Wayne Weyhrich ,  Rui Jian

IPC: C08J5/18 ,  H01L41/193 ,  H01L41/333 ,  H01L41/08

Abstract: A polymer thin film includes polyvinylidene fluoride (PVDF) and is characterized by a Young's modulus along an in-plane dimension of at least 4 GPa, an electromechanical coupling factor (k31) of at least 0.1 at room temperature. A method of manufacturing such a polymer thin film may include forming a polymer composition into a polymer thin film, applying a tensile stress to the polymer thin film along at least one in-plane direction and in an amount effective to induce a stretch ratio of at least approximately 5 in the polymer thin film, and applying an electric field across a thickness dimension of the polymer thin film. Annealing and poling steps may separately or simultaneously accompany and/or follow the act of stretching of the polymer thin film.

公开(公告)号：US20240084121A1

公开(公告)日：2024-03-14

申请号：US18174920

申请日：2023-02-27

Applicant: Meta Platforms Technologies, LLC

Inventor： Sheng Ye ,  Jinghui Yang ,  Rui Jian ,  Hao Mei ,  Andrew John Ouderkirk ,  Christopher Yuan Ting Liao ,  Stephen Hsieh ,  Alexander Keener ,  Jonathan Robert Peterson

IPC: C08L27/12 ,  B29C48/00 ,  B29K27/12

CPC classification number: C08L27/12 ,  B29C48/022 ,  H10N30/857 ,  B29K2027/12 ,  C08L2203/16 ,  C08L2205/16

Abstract: A mechanically and piezoelectrically anisotropic polymer article is formed from a crystallizable fluoropolymer and a nucleating agent. The polymer article may be a thin film or a fiber, for example. A crystalline phase may constitute at least approximately 50% of the polymer article. In certain examples, a fluoropolymer may include vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropylene, and vinyl fluoride. The polymer article may include up to approximately 10 wt. % of the nucleating agent. Such a polymer article is optically transparent, has an elastic modulus of at least approximately 3 GPa, and an electromechanical coupling factor (k31) of at least approximately 0.15.

公开(公告)号：US11987677B2

公开(公告)日：2024-05-21

申请号：US17559655

申请日：2021-12-22

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Sheng Ye ,  Hao Mei ,  Cody Wayne Weyhrich ,  Arman Boromand ,  Andrew John Ouderkirk ,  Christopher Yuan Ting Liao ,  Emma Rae Mullen ,  Christopher Stipe ,  Nagi Hosni Elabbasi ,  Rui Jian

IPC: C08L27/16 ,  C08J5/18 ,  C08L27/14 ,  C08L27/04 ,  C08L27/12

CPC classification number: C08J5/18 ,  C08L27/16 ,  C08J2427/16 ,  C08L27/04 ,  C08L27/12 ,  C08L27/14 ,  C08L2201/10 ,  C08L2203/16 ,  C08L2205/02

Abstract: A mechanically and piezoelectrically anisotropic polymer thin film is formed from a crystallizable polymer and an additive configured to interact with the polymer to facilitate chain alignment and, in some examples, create a higher crystalline content within the polymer thin film. The polymer thin film and its method of manufacture may be characterized by a bimodal molecular weight distribution where the molecular weight of the additive may be less than approximately 5% of the molecular weight of the crystallizable polymer. Example polymers may include vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropylene, and vinyl fluoride. Example additives may occupy up to approximately 60 wt. % of the polymer thin film. The polymer thin film may be characterized by a piezoelectric coefficient (d31) of at least approximately 5 pC/N or an electromechanical coupling factor (k31) of at least approximately 0.1.

公开(公告)号：US20220348729A1

公开(公告)日：2022-11-03

申请号：US17559655

申请日：2021-12-22

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Sheng Ye ,  Hao Mei ,  Cody Wayne Weyhrich ,  Arman Boromand ,  Andrew John Ouderkirk ,  Christopher Yuan Ting Liao ,  Emma Rae Mullen ,  Christopher Stipe ,  Nagi Hosni Elabbasi ,  Rui Jian

IPC: C08J5/18

Abstract: A mechanically and piezoelectrically anisotropic polymer thin film is formed from a crystallizable polymer and an additive configured to interact with the polymer to facilitate chain alignment and, in some examples, create a higher crystalline content within the polymer thin film. The polymer thin film and its method of manufacture may be characterized by a bimodal molecular weight distribution where the molecular weight of the additive may be less than approximately 5% of the molecular weight of the crystallizable polymer. Example polymers may include vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropylene, and vinyl fluoride. Example additives may occupy up to approximately 60 wt. % of the polymer thin film. The polymer thin film may be characterized by a piezoelectric coefficient (d31) of at least approximately 5 pC/N or an electromechanical coupling factor (k31) of at least approximately 0.1.