Synthesis of Water-based Isocyanate-Free Poly (Hydroxy Urethane) Films and Investigation of Their Self-Healing Properties

Yıl 2024, , 1 - 11, 27.04.2024

Dilek Dalgakıran

https://doi.org/10.19113/sdufenbed.1195161

Öz

This research aimed to develop water-soluble isocyanate-free
poly(hydroxyl urethane) (PHU)s with phosgene-free, low-in-volatile organic
compounds (VOCs) emission and analyze their self-healing properties. Disulfide
bonds were introduced into the polymer backbone of PHUs to constitute the self
healing capability. With a solid content of 30%, WSPHU dispersion was prepared
without co-solvent. To form the network structure of WSPHUs, different ratios of
hexakis methoxymethyl melamine (HMMM) were used. Transparent and thermally
stable WSPHUs were developed by using different ratios of HMMM (2-8% by weight).
The films were damaged with 180 grit sandpaper and kept at 80 oC in an oven. By
using an optical microscope, it was observed that damaged films repaired themselves
to varying degrees. According to the experimental results, HMMM ratio and extent of
the damage (scratch thickness) significantly impact the self-healing abilities of the
WSPHUs. This is a pioneering study in identifying the development of self-healing
isocyanate-free WSPHUs for the future.

Anahtar Kelimeler

Self-healing, Isocyanate-free, Poly( hydroxy urethane), water-based

Proje Numarası

2018/AP/0008

İzosiyanat İçermeyen Su Esaslı Poli (Hidroksi Üretan) Filmlerin Sentezi ve Kendini Onarma Özelliklerinin İncelenmesi

Öz

Bu araştırmada, fosgensiz ve düşük uçucu organik bileşik (UOB), (volatile organic
compunds, VOCs) emisyonuna sahip izosiyanat içermeyen su esaslı poli(hidroksil
üretan) (WPHU) filmlerin hazırlanması ve kendi kendini onarma özelliklerinin
incelenmesi hedeflenmiştir. WSPHU'ların kendi kendini onarma yeteneği polimer ana
zincirine disülfür bağları eklenmesiyle sağlanmıştır. %30 katı içeriğe sahip WSPHU
dispersiyonu herhangi bir yardımcı çözücü olmadan sadece su ile hazırlanmıştır.
WSPHU'ların ağ yapısını oluşturmak için hexakis metoksimetil melamin (HMMM)
kullanılmıştır. Şeffaf görünümde ve ısıl olarak kararlı WSPHU filmler farklı oranlarda
HMMM (ağırlıkça %2-8) kullanılarak hazırlanmıştır. 180 numara zımpara ile
hasarlanan filmler etüvde 24 saat 80 oC'de bekletildikten sonra kendi kendini onarma
özellikleri incelenmiştir. Optik mikroskopla yapılan gözlemler neticesinde hasarlı
filmlerin kendi kendilerini farklı derecelerde onardığı görülmüştür. Deney
sonuçlarına göre HMMM oranı ve hasarın büyüklüğü (çizik kalınlığı), WSPHU'ların
kendi kendini onarma yetenekleri üzerinde önemli bir etkiye sahiptir. Filmdeki
HMMM oranı %4’te çizik kalınlıkları da dikkate alındığında kendi kendini onarma
performansı en iyidir. Mevcut çalışma, kendi kendini onaran izosiyanat içermeyen
WSPHU'ların geliştirilmesi için öncü bir çalışma niteliğindedir.

Anahtar Kelimeler

Kendi kendini onaran, Poli (Hidroksi Üretan), Su esaslı, izosiyanat içermeyen

Destekleyen Kurum

Yalova Üniversitesi Bilimsel Araştırma Projeleri Birimleri

Proje Numarası

2018/AP/0008

Teşekkür

Bu çalışma Yalova Üniversitesi Bilimsel Araştırma Projeleri Birimleri tarafından desteklenmiştir (Proje No: 2018/AP/0008).

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