The polymorphic composition of long-chain branched polypropylene processed by injection and compression molding

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F23%3A63569418" target="_blank" >RIV/70883521:28110/23:63569418 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.expresspolymlett.com/search.php" target="_blank" >http://www.expresspolymlett.com/search.php</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3144/expresspolymlett.2023.77" target="_blank" >10.3144/expresspolymlett.2023.77</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The polymorphic composition of long-chain branched polypropylene processed by injection and compression molding

Popis výsledku v původním jazyce

The impact of injection molding processing parameters, including mold temperature, injection speed, and holding pressure, on the supermolecular structure of long-chain branched polypropylene (LCB-PP) was investigated. Commercial LCB-PP was processed under different conditions, with four sets of processing parameters applied. Holding pressure was varied from 30–70 MPa by 10 MPa in the P-SET, mold temperature was raised from 40 to 120 °C in 20 °C steps in the T-SET, and injection speed increased from 20 to 140 mm/s in 30 mm/s steps in S-SET1 and S-SET2, with mold temperatures at 40 or 120 °C. The polymorphic composition of the specimens was analyzed using wide-angle X-ray scattering, demonstrating a strong dependence on the processing parameters. The skin of the specimens showed an increase in β-phase content with higher mold temperature and injection speed. Conversely, growing holding pressure slightly suppressed β-phase content and promoted the formation of the γ-phase, which was predominantly manifested in the core of the specimens. The polymorphic composition, with both β-and γ-phases present in notable amounts, had a beneficial effect on the impact strength of the specimens.

Název v anglickém jazyce

The polymorphic composition of long-chain branched polypropylene processed by injection and compression molding

Popis výsledku anglicky

The impact of injection molding processing parameters, including mold temperature, injection speed, and holding pressure, on the supermolecular structure of long-chain branched polypropylene (LCB-PP) was investigated. Commercial LCB-PP was processed under different conditions, with four sets of processing parameters applied. Holding pressure was varied from 30–70 MPa by 10 MPa in the P-SET, mold temperature was raised from 40 to 120 °C in 20 °C steps in the T-SET, and injection speed increased from 20 to 140 mm/s in 30 mm/s steps in S-SET1 and S-SET2, with mold temperatures at 40 or 120 °C. The polymorphic composition of the specimens was analyzed using wide-angle X-ray scattering, demonstrating a strong dependence on the processing parameters. The skin of the specimens showed an increase in β-phase content with higher mold temperature and injection speed. Conversely, growing holding pressure slightly suppressed β-phase content and promoted the formation of the γ-phase, which was predominantly manifested in the core of the specimens. The polymorphic composition, with both β-and γ-phases present in notable amounts, had a beneficial effect on the impact strength of the specimens.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Express Polymer Letters

ISSN

1788-618X

e-ISSN

—

Svazek periodika

17

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

11

Strana od-do

1031-1041

Kód UT WoS článku

001062444200005

EID výsledku v databázi Scopus

2-s2.0-85167413799