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Polybutadiene [butadiene rubber, BR] is a synthetic rubber. It offers high elasticity, high resistance to wear, good strength even without fillers, and excellent abrasion resistance when filled and vulcanized. "Polybutadiene" is a collective name for homopolymers formed from the polymerization of the monomer 1,3-butadiene.
Hydroxyl-terminated polybutadiene (HTPB) is an oligomer of butadiene terminated at each end with a hydroxyl functional group. It reacts with isocyanates to form polyurethane polymers. HTPB is a translucent liquid with a color similar to wax paper and a viscosity similar to corn syrup.
Isotactic PB-1 is produced commercially using two types of heterogeneous Ziegler–Natta catalysts. [3] The first type of catalyst contains two components, a solid pre-catalyst, the δ-crystalline form of TiCl 3, and solution of an organoaluminum cocatalyst, such as Al(C 2 H 5) 3.
1,3-Butadiene (/ ˌ b juː t ə ˈ d aɪ iː n / ⓘ) [8] is the organic compound with the formula CH 2 =CH-CH=CH 2.It is a colorless gas that is easily condensed to a liquid. It is important industrially as a precursor to synthetic rubber. [9]
Polybutene is an organic polymer made from a mixture of 1-butene, 2-butene, and isobutylene.Ethylene steam cracker C4s are also used as supplemental feed for polybutene. It is similar to polyisobutylene (PIB), which is produced from essentially pure isobutylene made in a C4 complex of a major refinery.
Indonesian Arabic (Arabic: العربية الاندونيسية, romanized: al-‘Arabiyya al-Indūnīsiyya, Indonesian: Bahasa Arab Indonesia) is a variety of Arabic spoken in Indonesia. It is primarily spoken by people of Arab descents and by students ( santri ) who study Arabic at Islamic educational institutions or pesantren .
The official number of Arab and part-Arab descent in Indonesia was recorded since 19th century. The census of 1870 recorded a total of 12,412 Arab Indonesians (7,495 living in Java and Madura and the rest in other islands). By 1900, the total number of Arabs citizens increased to 27,399, then 44,902 by 1920, and 71,335 by 1930. [5]
The members of the association declared their oath affirming their allegiance to Indonesia as their homeland (rather than Hadhramaut) and Bahasa Indonesia as their mother tongue. [4] The Arab-Indonesian youth also pledged three oaths ("Sumpah Pemuda Keturunan Arab"): The motherland of Arab-Indonesians is Indonesia.