Cam elyaf/talk hibridizasyon oranının polipropilen kompozitlerin viskoelastik, termal ve morfolojik özellikleri üzerindeki etkisi

Abstract

Bu çalışmada, kısa cam elyaf (GF) ve partikül talk kullanılarak yapılan hibrit takviyenin, polipropilen (PP) kompozitlerin viskoelastik, termal ve mikroyapısal özellikleri üzerindeki etkileri incelenmiştir. Hibrit kompozitler, %40 ağırlıkça GF takviyeli PP ve %40 ağırlıkça talk dolgulu PP'nin çeşitli ağırlık oranlarında (100/0, 0/100, 25/75, 50/50 ve 75/25) eritilerek birleştirilmesi yoluyla üretilmiştir. Dinamik Mekanik Analiz (DMA), tamamen GF takviyeli sistemdeki sürekli lifli ağın nispeten daha yüksek depolama modülü değerleri (~4100 MPa) sergilediğini ortaya koyarken, talk ilavesinin viskoz dağılımın azalmasıyla daha dengeli bir sertlik davranışına katkıda bulunduğu görülmüştür. Termogravimetrik Analiz (TGA), talk bakımından zengin hibrit formülasyonun (%25 GF / %75 Talk) ilk termal bozunmanın başlangıcını (T5%) geciktirdiğini göstermiştir; bu durum, uçucu difüzyona karşı talk partiküllerinin bariyer etkisiyle ilişkili olabilir. Ayrıca, Diferansiyel Taramalı Kalorimetri (DSC) analizi, dengeli hibrit formülasyonun (%50 GF / %50 Talk) incelenen sistemler arasında en yüksek kristallik derecesini sergilediğini göstermiştir; bu, tek dolgu maddeli talk kompozitine kıyasla yaklaşık %67'lik bir artışa karşılık gelmektedir. Taramalı Elektron Mikroskobu (SEM) gözlemleri, dengeli hibrit yapıda nispeten daha homojen bir morfoloji, nispeten tekdüze dolgu maddesi-matris morfolojisi ve azalmış görünür boşluk oluşumu ortaya koyarak termomekanik bulguları desteklemiştir. Genel olarak, sonuçlar sistematik GF/talk hibridizasyonunun, mühendislik uygulamaları için ticari olarak bileştirilmiş PP kompozitlerin termomekanik performans dengesini ayarlamak için etkili bir strateji sağladığını göstermektedir.

Keywords

• Polipropilen
• Hibrit kompozitler
• Cam elyafı
• Talk
• Viskoelastik özellikler
• Termal analiz

Supporting Institution

Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)

Project Number

1919B012419735

Thanks

Bu çalışma, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK) tarafından 2024/1 dönemi 2209-A - Üniversite Öğrencileri Araştırma Projeleri Destekleme Programı kapsamında desteklenmiştir (Proje Numarası: 1919B012419735). Katkılarından dolayı TÜBİTAK'a teşekkürlerimizi sunarız.

Effect of glass fiber/talc hybridization ratio on the viscoelastic, thermal, and morphological properties of polypropylene composites

Abstract

This study investigates the effects of systematically redistributing a constant nominal reinforcement content of 40 wt% between short glass fibers (GF) and particulate talc on the viscoelastic, thermal, crystallization, and morphological properties of polypropylene (PP) composites. Commercial PP compounds containing 40 wt% GF (GF40) and 40 wt% talc (TF40) were melt-blended at GF40/TF40 ratios of 100/0, 0/100, 25/75, 75/25, and 50/50, while maintaining an approximately constant PP matrix content of 60 wt%. Dynamic Mechanical Analysis showed that the GF-only formulation exhibited the highest storage modulus, approximately 4100 MPa, whereas increasing talc content generally reduced viscous energy dissipation. Thermogravimetric Analysis indicated that the talc-rich C2 and C3 formulations exhibited closely comparable delayed degradation onset. C3 showed the highest measured T_(5%)and T_(10%)values of 437.02 and 447.25 ℃, respectively, while C2 exhibited corresponding values of 435.35 and 446.55 ℃, indicating a formulation-dependent response rather than a simple monotonic talc barrier effect. Differential Scanning Calorimetry showed that C1 and the GF-dominant hybrid C4 exhibited the highest and nearly comparable PP matrix crystallinity values of 43.3% and 43.0%, respectively. Scanning Electron Microscopy observations revealed formulation-dependent fracture-surface features, including exposed fibers, particle-rich regions, and localized voids. Overall, the results demonstrate that redistributing a constant reinforcement content between GF and talc provides a practical approach for tailoring stiffness, energy dissipation, degradation behavior, and crystallization performance in commercially compounded PP systems.

Keywords

• Polypropylene
• Hybrid composites
• Glass fiber
• Talc
• Viscoelastic properties
• Thermal analysis

Supporting Institution

The Scientific and Technological Research Council of Turkey (TÜBİTAK)

Project Number

1919B012419735

Thanks

This study was supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) under the 2024/1 cycle of the 2209-A - Research Project Support Program for University Students (Project Number: 1919B012419735). We would like to express our gratitude to TÜBİTAK for their support.

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