TAILIEUCHUNG - Nuclear Power Operation Safety and Environment Part 13

Tham khảo tài liệu 'nuclear power operation safety and environment part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Effects of Gamma-Ray Irradiation on Tracking Failure of Polymer Insulating Materials 349 interval the carbonization forms more quickly and the brief short circuit occurs more frequently and the discharges could not completely take place so the total discharge quantity is smaller as shown in Fig. 7b. The dielectric properties are improved for PBN but worsened for PBT by gamma-ray irradiation. This difference is attributed to the radiation-induced cross-linking and degradation. The effect of the total dose on electrical properties is markedly different depending on the chemical structure of the base polymer. The radiation adds a particular dimension to the aging problem because it interacts strongly with materials in general and brings about structural changes that alter their properties. This is because that it can alter the macroscopic properties of polymeric materials through mechanisms like chain scission cross linking and oxidation. Comparing the molecule formulas there are two phenyls in the main chain of PBN but one for PBT. The amount of phenyl in the main chain plays a main role on the result of the radiation reaction. In another word the dielectric properties of polybutylene polymers are improved for PBN which contains more combined phenyls in the main chain. It is known that to disrupt the two combined phenyls needs more energy than one phenyl. It is supposed that the disruption of the bonds is harder for PBN than PBT after the same dosage of the irradiation. The formation of new bonds does not seem to have much difference because of the same fringe structure. The new main chain is bigger for PBN because of more phenyls. For PBN it is considered that the effects of the new bonds exceed the disruptive ones. For PBT it is considered to be opposite to PBN. Therefore PBN represents cross-linking type results and PBT represents scission type results. Effects of tracking resistance by use of IEC60112 method To estimate the resistance to tracking of polymer .

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.