Today's KNOWLEDGE Share : PPS & mould surface temperature as key to high crystallinity and performance

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Today's KNOWLEDGE Share

PPS & mould surface temperature as key to high crystallinity and performance


Polyphenylene sulfide (PPS) is a high-performance thermoplastic that is used in a variety of applications, including automotive, aerospace, and electronics. Injection moulding is a common method for processing PPS, but it is important to control the mould surface temperature in order to achieve optimal crystallinity and performance in the molded parts.


In this blog post, we discuss the importance of mould surface temperature for PPS injection moulding.


📌 Key points to consider with PPS & injection moulding:

1️⃣ Mould surface temperature for PPS should be between 135° and 150°C in order to obtain high levels of crystallinity.

2️⃣ "Hot mould" temperatures (above 135°C) are preferred for precision parts as they promote crystallization, resulting in the best overall appearance, thermal stability, and dimensional stability.

3️⃣ After moulding the PPS part, use DSC to check if the part was fully crystallized and as a consequence, all important properties such as thermal and chemical stability, as well as dimension stability are fully developed.


📌 This brings me to the figure below:

It shows the results of two DSC curves. The upper curve shows a not fully crystallized PPS, having a so-called cold crystallisation peak at 114°C (exothermal) and a melting peak at 282°C. The lower curve shows a fully crystallised PPS part having only a melting peak at 282°C.


Check out the full post here 👉 https://lnkd.in/dAAxXHTJ


🔥 New post: PPS & mould surface temperature as key to high crystallinity and performance

Polyphenylene sulfide (PPS) is a high-performance thermoplastic that is used in a variety of applications, including automotive, aerospace, and electronics. Injection moulding is a common method for processing PPS, but it is important to control the mould surface temperature in order to achieve optimal crystallinity and performance in the molded parts.


📌 Key points to consider with PPS & injection moulding:

1️⃣ Mould surface temperature for PPS should be between 135° and 150°C in order to obtain high levels of crystallinity.

2️⃣ "Hot mould" temperatures (above 135°C) are preferred for precision parts as they promote crystallization, resulting in the best overall appearance, thermal stability, and dimensional stability.

3️⃣ After moulding the PPS part, use DSC to check if the part was fully crystallized and as a consequence, all important properties such as thermal and chemical stability, as well as dimension stability are fully developed.


📌 This brings me to the figure below:

It shows the results of two DSC curves. The upper curve shows a not fully crystallized PPS, having a so-called cold crystallisation peak at 114°C (exothermal) and a melting peak at 282°C. The lower curve shows a fully crystallised PPS part having only a melting peak at 282°C.


Check out the full post here 👉 https://lnkd.in/dAAxXHTJ


source: Herwig Juster


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