Ảnh hưởng của độ ẩm và nhiệt độ môi trường đến độ bền cơ lý của polyme blend poly(butylene adipate-co-terephthalate)/tinh bột dong riềng=Effect of humidity and temperature on the mechanical strength of poly(butylene adipate-co-terephthalate)/canna starch polymer blend

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Tác giả: Thu Trang Phạm

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học và Công nghệ Việt Nam, 2025

Mô tả vật lý: tr.13-17

Bộ sưu tập: Metadata

ID: 478457

Thêm vào giỏ

Poly(butylene adipate-co-terephthalate)/canna starch (PBAT/TB) polymer blend was prepared using a twin-screw internal mixer (Brabender). The effects of humidity and temperature on the mechanical strength of PBAT/TB materials were carefully evaluated at humidity levels of 35-95% and temperatures of 10-40°C. Moisture content, mechanical properties, and surface morphology (observed using scanning electron microscopy - SEM) were analysed to evaluate the changes in the polymer blend during storage under different conditions. The study results showed that the moisture content of the polymer blend PBAT/TB increased when the environmental humidity increased. When the sample was stored at low temperature (10-25°C) and low humidity (35-55%), the mechanical properties of PBAT/TB decreased slightly after six months of storage, the fracture surface morphology of the sample did not change significantly. When the sample was stored at a high temperature (40°C) and high humidity (95%), the mechanical properties of the sample decreased sharply (~45%), and the surface of the sample material exhibited phase separation between the starch and the PBAT resin matrix.Polyme blend poly(butylene adipate-co-terephthalate)/tinh bột dong riềng (PBAT/TB) được chế tạo trên thiết bị trộn kín 2 trục vít Brabender. Nghiên cứu đánh giá ảnh hưởng của độ ẩm (35-95%) và nhiệt độ (10-40ºC) đến độ bền cơ lý của vật liệu PBAT/TB. Các phương pháp: hàm lượng ẩm, tính chất cơ học và hình thái học bề mặt (quan sát bằng kính hiển vi điện tử quét - SEM) được sử dụng để đánh giá sự thay đổi của vật liệu trong quá trình bảo quản ở các điều kiện khác nhau. Kết quả nghiên cứu cho thấy, hàm lượng ẩm của polyme blend PBAT/TB tăng khi độ ẩm môi trường tăng. Khi bảo quản ở nhiệt độ thấp (10-25ºC) và độ ẩm thấp (35-55%), tính chất cơ học của vật liệu giảm nhẹ sau 6 tháng bảo quản, bề mặt của mẫu biến đổi không nhiều. Khi bảo quản ở nhiệt độ cao (40ºC) và độ ẩm cao (95%), tính chất cơ học của vật liệu giảm mạnh (~45%), bề mặt mẫu vật liệu xuất hiện các điểm phân pha giữa tinh bột và nền nhựa PBAT.

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