Synthesis and Characterization of Resol Type Phenolic Resins

Yıl 2020, Cilt: 20 Sayı: 3, 407 - 417, 30.06.2020

Ferda Mindivan Ahmet Gürses

https://doi.org/10.35414/akufemubid.649241

Öz

The different pre-polymerization temperatures and various formaldehyde/phenol (F:P) ratios have a critical importance in the synthesis of resol phenolic resin. Understanding the reaction parameters in polymerization reactions is a prerequisite for the production of phenolic resin-based composite materials. X-Ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC) and microhardness analysis were performed to observe the effect of different pre-polymerization temperatures and various F: P ratios. The results of XRD and FTIR analysis provided an understanding of the structural conformation of synthesized resins. It was also found by the DSC and microhardness analysis that the tendency of crystallization increased for the synthesized resin (PFR250) when the pre-polymerization temperature was 50 °C and the F:P ratio was 1,3, especially in parallel with increasing ether bridges.

Anahtar Kelimeler

Resol phenolic resin, Pre-polymerization temperature, Formaldehyde / phenol ratio, Thermal analysis, Micro hardness, Structural conformation

Resol Tipi Fenolik Reçinelerin Sentezi ve Karakterizasyonu

Öz

Farklı ön polimerizasyon sıcaklıkları ve çeşitli formaldehit / fenol (F: P) oranları, resol fenolik reçinenin sentezinde kritik bir öneme sahiptir. Polimerizasyon reaksiyonlarında reaksiyon parametrelerinin anlaşılması, fenolik reçine bazlı kompozit malzemelerin üretimi için ön şarttır. Farklı ön polimerizasyon sıcaklıkları ve çeşitli F:P oranlarının etkisini gözlemlemek için, X-Işını difraksiyonu (XRD), Fourier dönüşümlü infrared spektroskopisi (FTIR), Diferansiyel taramalı kalorimetri (DSC) ve mikro sertlik analizleri yapılmıştır. XRD ve FTIR analizlerinin sonuçları, sentezlenmiş reçinelerin yapısal konformasyonunun anlaşılmasını sağlamıştır. DSC ve mikro sertlik analiz sonuçlarıyla, ön-polimerizasyon sıcaklığı 50 °C ve F:P oranı 1,3 iken sentezlenen reçinenin (PFR250) artan eter köprülerine paralel olarak kristalleşme eğiliminin arttığı tespit edilmiştir.

Anahtar Kelimeler

Resol fenolik reçine, Ön polimerizasyon sıcaklığı, Formaldehit/fenol oranı, Termal analiz, Mikro sertlik, Yapısal konformasyon

Kaynakça

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