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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 4. Отображено 4.
04-07-2023 дата публикации

Heat-resistant polycarbonate and preparation method thereof

Номер: CN116375998A
Автор: LI CHENG, SUI DONGWU, PAN YONGJUN, GAO JUNMIN, LIU XIANGJIA, WANG YAQING
Принадлежит:

The invention relates to heat-resistant polycarbonate with improved impact resistance and a preparation method thereof. The polycarbonate contains a structural unit derived from a bisphenol compound (I), the weight-average molecular weight of the polycarbonate is 5000-300000, the Vicat softening point temperature of the polycarbonate measured by adopting the ASTM D1525 standard is 170-200 DEG C, and the notch impact strength of the polycarbonate measured by adopting the ASTM D256 standard is 400-800 J/m.

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Номер записи: 1
06-06-2023 дата публикации

Polycarbonate with wear resistance

Номер: CN116217911A
Автор: GAO JUNMIN, LI CHENG, LUO JIAHUI, SUI DONGWU, LI QIANG, ZHANG HUAIQIANG
Принадлежит:

The invention provides polycarbonate, which adopts amide-containing aromatic phenol as an end-capping reagent, and selects an amide-substituted aromatic compound as the end-capping reagent for controlling the molecular weight of a polymer, thereby preparing the polycarbonate with excellent wear resistance. The polycarbonate has a smooth surface, is wear-resistant and scratch-resistant, and can be used in the fields of abrasion or frequent friction of various complex particles in air, such as automobile headlamps, optical data recording media and the like.

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Номер записи: 2
08-08-2023 дата публикации

Low-ring-content polycarbonate resin and preparation method thereof

Номер: CN116554456A
Автор: GAO JUNMIN, LI CHENG, LI CUN, LUO JIAHUI, LI QIANG, SUI DONGWU, WANG XIAODONG
Принадлежит:

The invention provides polycarbonate resin and a preparation method thereof, and the polycarbonate resin has the following characteristics: 1) the polycarbonate resin is extracted with a poor solvent, and the mass fraction of the solvent extract in the total resin is not more than 2%; 2) the proportion of cyclic oligomers (the sum of D3-D10) in the solvent extract does not exceed 50 wt%; 3) the proportion of cyclic oligomers (hereinafter referred to as D3) corresponding to three monomer units in a solvent extract does not exceed 25wt%; and 4) the polycarbonate resin has a structural unit as shown in a formula II. The resin provided by the invention has excellent optical performance and ultraviolet aging resistance, and is mainly applied to the light guide field of automobile components and the like.

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Номер записи: 3
19-05-2023 дата публикации

Copolycarbonate and preparation method thereof

Номер: CN116135905A
Автор: LIU LONGYANG, LI CHENG, GAO JUNMIN, WEI ZHITAO, WANG YAQING, LIU XIANGJIA, LUO JIAHUI
Принадлежит:

The invention provides copolycarbonate and a preparation method thereof. The invention particularly relates to a novel copolymer with a molecular chain containing a biological polysaccharide chain segment and a polycarbonate chain segment and a preparation method thereof. The copolymer is novel in structure, a biological polysaccharide chain segment and a quaternary amine chain segment are introduced into a polycarbonate chain segment in a copolymerization mode, and the obtained copolycarbonate can remarkably improve the antibacterial performance, the biocompatibility and the impact resistance of conventional polycarbonate. The polycarbonate copolymer is prepared by copolymerizing the comonomer and the polycarbonate oligomer under the action of the catalyst, is simple to operate and easy to implement, and can be applied to industrial production.

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Номер записи: 4