Ảnh chụp kính hiển vi điện tử quét của PMMA đƣợc tổng hợp bằng phƣơng pháp trùng hợp nhũ tƣơng ở 3 độ phóng đại: 5000, 10000, 20000 đƣợc biểu diễn trên hình 10.
Qua quan sát SEM thấy rằng sản phẩm tồn tại thành từng đám có kích thƣớc hạt trung bình 350nm, sự phân bố kích thƣớc hạt tƣơng đối đồng đều.
KẾT LUẬN
Qua một thời gian nghiên cứu và thực hiên đề tài, chúng tôi rút ra một số kết luận nhƣ sau:
1. Đã trùng hợp thành công PMMA bằng phƣơng pháp trùng hợp nhũ tƣơng với sự có mặt của chất khơi mào
2. Đã nghiên cứu một số yếu tố ảnh hƣởng đến quá trình trùng hợp: loại chất nhũ hoá, nhiệt độ, thời gian, hàm lƣợng chất khơi mào, nông độ môn tham gia trùng hợp. Từ các kết quả nghiên cứu chúng tôi đã rút ra các điều kiện tối ƣu để thực hiện phản ứng trùng hợp nhũ tƣơng PMMA là:
Chất nhũ hoá: NP9 - Hàm lƣợng chất nhũ hoá: 2% - Nhiệt độ: 700C - Thời gian: 120 phút - Hàm lƣợng chất khơi mào: 1,77% - Nồng độ monome: 11,28%
3. Đã khảo sát cấu trúc và một số tính chất vật lý của sản phẩm: phổ hồng ngoại (IR), phân tích nhiệt trọng lƣợng (TGA), nhiệt vi sai quét (DSC), và chụp ảnh kính hiển vi điện tử quét (SEM), sản phẩm có kích thƣớc hạt trung bình 350nm, có nhiệt độ hoá thuỷ tinh là 133,140C
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