Precision Acoustics PVdF

Precision Acoustics PVdF

PVdF is one of the most widely known piezo-polymers, exhibiting strong piezo- and pyro-electric response, and has an acoustic impedance much closer to water than conventional piezo-ceramic materials.

PVdF 是广为人知的压电聚合物之一，具有强烈的压电和火电响应，声阻抗比传统压电陶瓷材料更接近水。

Overview 概述

Piezo-electric PVdF

压电 PVdF

PVdF is one of the most widely known piezo-polymers. PVdF exhibits strong piezo- and pyro-electric response and has an acoustic impedance that is much closer to water than conventional piezo-ceramic materials. These properties have made it highly desirable for the production of ultrasonic sensors. PVdF is chemically resistant and is mechanically resilient. However, its piezo-properties will start to degrade if exposed to elevated temperatures which will begin to unlock the polarisation necessary for the piezo-electric properties of the film. As a general rule, PVdF should be kept and used below 60 °C and exposure to temperatures above 100 °C is likely to remove the majority of piezo-electric behaviour.

PVdF 是最广为人知的压电聚合物之一。PVdF 表现出强烈的压电和热电响应，声阻抗比传统压电陶瓷材料更接近水。这些特性使其在制造超声波传感器方面极具吸引力。PVdF 具有耐化学性且具有机械韧性。然而，如果暴露在高温下，其压电性能会开始退化，从而解锁薄膜压电特性所需的偏振。一般来说，PVdF 应保持并使用低于 60°C 的温度，暴露在 100°C 以上的温度下，通常能消除大部分压电行为。

To facilitate our customers who wish to purchase small quantities of piezo-electric polymers we stock a range of poled PVdF film – golded and ungolded options available. This can be supplied with or without Cr-Au coating. Some of the different options are listed below:

为了方便客户购买少量压电聚合物，我们备有多种极极 PVdF 薄膜——有镀金和未镀金两种选择。这种产品可以带或不带铬氧化铝涂层。以下是一些不同的选择：

Properties of poled piezo-electric PVdF film

极极压电 PVdF 薄膜的性能

The process of turning PVdF from an inert polymer to a poled piezo-electric film is a complicated one involving several changes. Partly due to this, and partly due to the inherent randomness of the semi-amorphous structure of PVdF, there can be considerable variation in the material properties of the final material.

将 PVdF 从惰性聚合物转变为极极压电薄膜的过程复杂且涉及多项变化。部分原因是此，部分由于 PVdF 半非晶结构的固有随机性，最终材料的材料性质可能存在较大变化。

Consequently, the materials properties listed in the data sheet provide an indication of the typical values, rather than any guarantee of exact data

因此，数据表中列出的材料性质仅提供典型值的指示，而非保证数据的准确性。

How to use PVdF

如何使用 PVdF

PVdF is pre shrunk prior to the deposition of electrodes and further “shrinking” is not required.

PVdF 在电极沉积前已预收缩，无需进一步“收缩”。

Exposure to temperatures above 80 °C will start to irreversibly degrade the performance of PVdF.

暴露于高于 80°C 的温度将开始不可逆地降低 PVdF 的性能。

Do not solder onto PVdF as this can cause local depolarization.

不要焊接 PVdF，因为这可能导致局部去极化。

To make a connection to the metallised PVdF consider the use of:

为了与金属化 PVdF 建立联系，考虑使用：

Mechanical connection via a crimp or fold.

通过压接或折叠实现机械连接。

Adhesive connection using silver loaded epoxy.

用银填充环氧树脂粘合连接。

To bond PVdF to a substrate use a low viscosity epoxy or nitrile contact adhesive. In either case make sure sufficient pressure is applied during cure.

要将 PVdF 粘结到基材上，可以使用低粘度的环氧树脂或腈接触胶。无论哪种情况，确保固化时施加足够的压力。

To cut PVdF use a sharp scalpel.

切割 PVdF 需要用锋利的手术刀。