Nanometer-size anisotropy of injection-molded polymer micro-cantilever arrays

Urwyler, Prabitha; Deyhle, Hans; Bunk, Olivier; Kristiansen, Per Magnus; Mueller, Bert (2012). Nanometer-size anisotropy of injection-molded polymer micro-cantilever arrays. Journal of applied physics, 111(10), p. 103530. American Institute of Physics 10.1063/1.4720942

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Understanding and controlling the structural anisotropies of injection-molded polymers is vital for designing products such as cantilever-based sensors. Such micro-cantilevers are considered as cost-effective alternatives to single-crystalline silicon-based sensors. In order to achieve similar sensing characteristics,structure and morphology have to be controlled by means of processing parameters including mold temperature and injection speed. Synchrotron radiation-based scanning small- (SAXS) and wide-angle x-ray scattering techniques were used to quantify crystallinity and anisotropy in polymer micro-cantilevers with micrometer resolution in real space. SAXS measurements confirmed the lamellar nature of the injection-molded semi-crystalline micro-cantilevers. The homogenous cantilever material exhibits a lamellar periodicity increasing with mold temperature but not with injection speed. We demonstrate that micro-cantilevers made of semi-crystalline polymers such as polyvinylidenefluoride, polyoxymethylene, and polypropylene show the expected strong degree of anisotropy along the injection direction.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research > ARTORG Center - Gerontechnology and Rehabilitation

UniBE Contributor:

Urwyler-Harischandra, Prabitha

Subjects:

500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

0021-8979

Publisher:

American Institute of Physics

Language:

English

Submitter:

Prabitha Urwyler-Harischandra

Date Deposited:

27 Jun 2014 08:03

Last Modified:

20 Jul 2015 10:53

Publisher DOI:

10.1063/1.4720942

URI:

https://boris.unibe.ch/id/eprint/48972

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