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Tổng hợp và đặc trưng hóa các polybenzoxazin nhiệt rắn mới với các nhóm chức năng khác trong mạng lưới
Tóm tắt
Trong nghiên cứu này, các hệ thống nhiệt rắn hiệu suất cao mới dựa trên benzoxazin đa chức năng đã được phát triển. Đầu tiên, các monome 3-(2-hydroxyethyl)-3,4-dihydro-2H-1,3-benzoxazine (BzOH) và bis(3-(2-hydroxyethyl)-3,4-dihydro-2H-1,3-benzoxazinyl) isopropane (BzPOH) đã được tổng hợp bằng phản ứng giữa phenol hoặc bisphenol A, paraformaldehyde và ethanolamine. Sau đó, BzOH và BzPOH đã được chức năng hóa với anhydrit maleic sử dụng tỉ lệ định lượng của oxazine: anhydrit maleic (1:1) để sản xuất các dạng có khối lượng phân tử thấp với các nhóm axit carboxylic, được đặt tên là BzFA và BzPFA. Các sản phẩm đã được đặc trưng hóa bằng Phổ Resonance Hạt nhân (NMR), Máy sắc ký loại trừ kích thước (SEC), và Phổ hồng ngoại biến đổi Fourier (FTIR). BzFA và BzPFA có khối lượng phân tử trung bình trọng lượng lần lượt là 5000 g.mol−1 và 50.000 g.mol−1. Các hỗn hợp giữa các tiền chất mới và benzoxazin thông thường (BzBA) được lấy từ bisphenol A và anilin [bis(3-phenyl-3,4-dihydro-2H-1,3-benzoxazinyl) isopropane] đã được chuẩn bị. Quá trình đóng rắn đã được nghiên cứu bằng FTIR và Đo nhiệt lượng quét khác biệt (DSC), và các tính chất viscoelastic, cơ học, nhiệt và hình thái của vật liệu cũng đã được đánh giá. Các vật liệu thu được cho thấy các tính chất nhiệt, viscoelastic và cơ học tốt hơn so với polybenzoxazin thông thường. Các phép đo Kính hiển vi điện tử quét (SEM) cho thấy bề mặt vật liệu đồng nhất.
Từ khóa
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