Chuẩn bị aerogel nanofibril cellulose được liên kết chéo với khả năng hấp thụ nước và phục hồi hình dạng

Springer Science and Business Media LLC - Tập 22 - Trang 3715-3724 - 2015
Chae Hoon Kim1, Hye Jung Youn1, Hak Lae Lee1
1Department of Forest Sciences, Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea

Tóm tắt

Aerogel nanofibril cellulose (CNF) là vật liệu hứa hẹn cho nhiều ứng dụng do đặc tính xốp cao và siêu nhẹ của chúng. Mạng lưới sợi của aerogel CNF được liên kết với nhau thông qua liên kết hydro và sự rối rắm cơ học của các sợi kề nhau dễ dàng bị phá hủy khi tiếp xúc với nước. Trong nghiên cứu này, chúng tôi đã chuẩn bị aerogel CNF liên kết chéo bằng axit maleic và natri hypophosphite làm tác nhân liên kết. Trong bước đầu xử lý, CNF phân tán trong nước đã được phản ứng với axit maleic để tạo ra một liên kết este. Sau đó, natri hypophosphite được thêm vào dung dịch CNF đã được chức năng hóa bằng axit maleic và dung dịch này được làm đông nhanh bằng nitơ lỏng. Aerogel CNF đã thu được sau quá trình đông khô. Liên kết chéo của cellulose được hình thành thông qua phản ứng giữa liên kết đôi cacbon-cacbon của CNF đã chức năng hóa bằng axit maleic và hypophosphite. Aerogel CNF liên kết chéo thể hiện độ ổn định mạng tốt trong nước và khả năng đàn hồi sau khi nén.

Từ khóa

#aerogel nanofibril cellulose #liên kết chéo #khả năng hấp thụ nước #phục hồi hình dạng

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