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What is high melt strength polypropylene

Categories:Industry trends
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Time of issue:2022-10-28 14:38
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(Summary description)Usually amorphous polymers (such as ABS, PS) have rubber-like elastic behavior in a wide temperature range, while semi-crystalline polypropylene does not.

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What is high melt strength polypropylene

(Summary description)Usually amorphous polymers (such as ABS, PS) have rubber-like elastic behavior in a wide temperature range, while semi-crystalline polypropylene does not.

Categories:Industry trends
Author:
Origin:
Time of issue:2022-10-28 14:38
Views:

Information

One of the disadvantages of polypropylene is its low melt strength and poor sag resistance. Usually amorphous polymers (such as ABS, PS) have rubber-like elastic behavior in a wide temperature range, while semi-crystalline polypropylene does not. This shortcoming results in that polypropylene cannot be thermoformed in a wide temperature range. Its softening point and melting point are very close. Once the melting point is reached, the melt viscosity drops sharply, followed by a sharp drop in melt strength, resulting in The uneven wall thickness of the product during molding and the collapse of extrusion foam cells greatly limit the application of polypropylene in some aspects.

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High melt strength polypropylene (HMSPP) refers to polypropylene whose melt strength is less sensitive to temperature and melt flow rate, and has great development and application prospects. HMSPP is a kind of polypropylene resin with long-chain branches. The long-chain branches are grafted in the post-polymerization. The melt strength of this homopolymer is 9 times that of ordinary polypropylene homopolymers with similar flow characteristics. When the density and melt flow rate are similar, the yield strength, flexural modulus, heat distortion temperature and melting point of HMSPP are higher than those of ordinary polypropylene, but the notched impact strength is lower than that of ordinary polypropylene.

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