Vectra resins are well known for their excellent thermal and hydrolytic stability. In order to ensure these properties are optimum, the resin should be dried correctly prior to processing. Vectra LCPs are shear thinning, their melt viscosity decreases quickly as shear rate increases. For parts that are difficult to fill, the molder can increase the injection velocity to improve melt flow. These values alone do not represent a sufficient basis for any part design and are not intended for use in establishing maximum, minimum, or ranges of values for specification purposes. Colorants or other additives may cause significant variations in data values.
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LCP is a family of high-performance plastics with very good mechanical properties. They are also extremely well flowable, enabling them to fill injection molds with long, narrow, and complex flow paths with minimal warpage. That is why they are well suited for use in filigree mold components needed for microelectronics. The abbreviation LCP does not denote any specific chemical composition in the way that PC stands for polycarbonate.
These are polymers with liquid crystalline properties. Certain areas of the material exist in the form of crystalline structures surrounded by amorphous areas.
The mechanical properties of liquid crystal polymer can be adjusted across a relatively broad spectrum by changing the ratio of crystalline and amorphous phases and the level of interlinking. In addition, the shape of these crystalline structures affects the properties of the material.
LCP therefore comes in different guises. As a result, the adhesion level achieved by the same adhesive on different grades of LCP such as Ei, Ei, or ET can vary significantly. Having said that, LCP is a material difficult to bond. Another bonding challenge is that LCP is frequently filled to approx. Since the second component to be joined often has a much higher CTE, the adhesive has to equalize additional tensions.
This is especially true after climatic storage at higher temperatures and high air humidity. The same diagram also shows that adhesion can be improved significantly through plasma pretreatment.
As the results show, LCP is easy to bond after all. The values remain at a high level even after aging. This improved adhesion is achieved by the plasma pretreatment, which breaks up the surface of LCP and exposes the glass fibers more strongly, as illustrated by these scanning electron microscopy SEM micrographs. However, excessive pretreatment can lead to poorer adhesion because the glass fibers are then no longer embedded sufficiently in the LCP matrix.
Generally, low pressure plasma is the LCP pretreatment method of choice, and the method gas used air, oxygen, or nitrogen does not have any decisive role to play. Alongside these, there are products for die attach applications that demonstrate good reflow stability.
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