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1,2-Propanediolizobutyl POSS như một chất chống cháy đồng cho polyurethane foam cứng
Tóm tắt
Các loại foam polyurethane (PU) được biến đổi vật lý bằng hai chất phụ gia chống cháy phosphor (FR)—phosphate phenol isobutylenated hoặc phosphate phenol isopropylated, và được gia cố hóa học bằng 1,2-propanediolizobutyl POSS (PHI-POSS) đã được tổng hợp và nghiên cứu về các tính chất nhiệt và cơ lý, cũng như hành vi chống cháy. Các vật liệu PU foam lai này được chuẩn bị thông qua quy trình hai bước sử dụng polyether polyol và polymeric 4,4′-diphenylmethane diisocyanate. Dựa trên các kết quả thu được về tính chất cơ học, cách nhiệt, độ ổn định nhiệt và nghiên cứu về tính chống cháy, ảnh hưởng của các chất phụ gia được áp dụng—bao gồm cả hạt nano POSS, trên các loại foam polyurethane cứng đã được xác định. Phân tích dữ liệu nhiệt trọng lượng và vi nhiệt cho thấy khả năng kháng cháy của các foam PU chứa hệ thống chống cháy phản ứng lai (POSS)/phụ gia (phosphate) được cải thiện, thể hiện qua tốc độ phát thải nhiệt giảm. Quan trọng là, các thử nghiệm tính chất cơ học cho thấy việc kết hợp các hạt nano silsesquioxane cồng kềnh vào cấu trúc polyurethane thông qua liên kết cộng hóa trị gia tăng tính toàn vẹn của foam.
Từ khóa
#polyurethane foam #phosphorous flame retardants #functionalized POSS #thermal properties #mechanical properties #flammabilityTài liệu tham khảo
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