Among lesbians, in a broad sense, both sides are divided into T (more responsibility), the abbreviation of English Tomboy, and P (more protection). In a narrow sense, T is masculine and P is feminine. PPL is a derivative word in a narrow sense, which means that both lesbians are feminine in appearance, and L refers to the first letter of the word "love". PPL often appears as a synonym for les literary works or in the language required by lesbians to make friends. PPL mostly appears in lesbian dating software in the form of some labels, such as Lala Park, as a condition for classifying labels or finding objects.
Brief introduction of properties of "para-polystyrene engineering plastics".
(1) Para-polyphenylene, also called polyphenylene, is a polymer linked by benzene rings.
(2) High temperature resistance: The "polystyrene" powder burned in a high-temperature furnace begins to decompose at 520℃ and has no melting point. After long-term heating and burning at 450℃, it loses weight slightly. It is an engineering plastic used for a long time below 400℃.
(3) Radiation resistance: it can accept 9* 10 6 lats under the irradiation of cobalt source (Co60), and its performance remains unchanged.
(4) Chemical corrosion resistance and solvent resistance: Up to now, a solvent that can dissolve polystyrene has not been found in the world, and strong acids such as sulfuric acid and hydrofluoric acid cannot corrode it.
(5) Electrical properties: the volume resistivity is 10 15 ohm-cm, and it can become an organic semiconductor under different polymerization conditions, and the volume resistivity is10/7 ohm-cm.
(6) Self-lubricating performance: It has good self-lubricating performance, far superior to molybdenum disulfide, graphite or other filled PTFE products.