However, the material is susceptible to attack from oxidizing acids, chlorinated hydrocarbons, and aromatics. Likewise, the necessity of transporting bulky scions is eliminated. (The technology has fallen into disuse). Similarly, the resulting plants in general have shortened stature and maturity as compared to plants propagated from seed. See more. It has also been used for sheets of yacht sails.[62][63]. Unlike expanded polystyrene foam (EPS) which is friable and breaks easily on impact, EPP foam is able to absorb kinetic impacts very well without breaking, retains its original shape, and exhibits memory form characteristics which allow it to return to its original shape in a short amount of time. Like grafting, this method is employed to convert one plant (the rootstock) into another plant type with desirable characteristics. It can be produced commercially either with a special type of supported Ziegler-Natta catalyst or with some metallocene catalysts. We're part of Translated, so if you ever need professional translation services, then go checkout our main site, Specifically, the virus was found to be detectable for up to three days on plastic, Usage Frequency: 1, Specifically, the virus was found to be detectable for one day on cardboard, for up to three days on plastic, budding plantWhat is Budding, Its Advantages and Trying to learn how to translate from the human translation examples. 4. [citation needed]. Food containers made from it will not melt in the dishwasher, and do not melt during industrial hot filling processes. After the product has cooled, the tubs are often given lids made of a less heat-resistant material, such as LDPE or polystyrene. Pronunciation of polypropylene and its etymology. As in rootstocks, the preparation techniques are numerous; If also wrapped, it must be opened about 15 days later or at the time when the rootstock is cut back. Polypropylene can also be made into disposable bottles to contain liquid, powdered, or similar consumer products, although HDPE and polyethylene terephthalate are commonly also used to make bottles. Polypropylene fibres are used as a concrete additive to increase strength and reduce cracking and spalling. Preparation of the rootstock. Learn more in the Cambridge English-Chinese simplified Dictionary. It can also be produced in sheet form, widely used for the production of stationery folders, packaging, and storage boxes. Polypropylene is a major polymer used in nonwovens, with over 50% used[citation needed] for diapers or sanitary products where it is treated to absorb water (hydrophilic) rather than naturally repelling water (hydrophobic). Information and translations of polypropylene in the most comprehensive dictionary definitions resource on the web. All state-of-the-art processes use either gas-phase or bulk reactor systems.[35]. A notable application was as a transvaginal mesh, used to treat vaginal prolapse and concurrent urinary incontinence. By continuing to visit this site you agree to our use of cookies. For this reason, most plastic tubs for dairy products are polypropylene sealed with aluminum foil (both heat-resistant materials). Polypropylene is used in polypropylene drums. They employ bridged bis-metallocene complexes of the type bridge-(Cp1)(Cp2)ZrCl2 where the first Cp ligand is the cyclopentadienyl group, the second Cp ligand is the fluorenyl group, and the bridge between the two Cp ligands is -CH2-CH2-, >SiMe2, or >SiPh2. What is Polypropylene (PP), and What is it Used For? Also it is recommended to clean with mineral spirits or similar alcohol prior to gluing to remove any oils or other contamination. [15], Syndiotactic polypropylene was discovered much later than isotactic PP and could only be prepared by using metallocene catalysts. Polypropylene is used in the manufacture of loudspeaker drive units. However, the aPP obtained this way is not completely amorphous but can still contain 15% crystalline parts. If union is not successful, it will turn black and rot; and MyMemory is the world's largest Translation Memory. For example, antistatic additives can be added to help polypropylene surfaces resist dust and dirt. Such applications occur in houses as water filters or in air-conditioning-type filters. [57], Some fashion designers have adapted polypropylene to construct jewelry and other wearable items. The inserted patch of bark will remain green or otherwise brownish depending on the natural color of the budstick. A specialized wrapping strip made of rubber expands as the rootstock grows and naturally deteriorates after several weeks. November 2011) polypropylene translation in English-Persian dictionary. The high surface-area and naturally oleophilic polypropylene nonwovens are ideal absorbers of oil spills with the familiar[citation needed] floating barriers near oil spills on rivers. Hydrocarbon slurry or suspension: Uses a liquid inert hydrocarbon diluent in the reactor to facilitate transfer of propylene to the catalyst, the removal of heat from the system, the deactivation/removal of the catalyst as well as dissolving the atactic polymer. PP is dope-dyed; no water is used in its dyeing, in contrast with cotton. Expanded Polypropylene (EPP) has been produced through both solid and melt state processing. Gas phase: Uses gaseous propylene in contact with the solid catalyst, resulting in a fluidized-bed medium. Correct polarity should be observed, that is, the patch of bark is oriented upward. These plastic strips have to be elastic and do not easily break when stretched; They are also referred to as single-bud scions. Bulk slurry (or bulk): Uses liquid propylene instead of liquid inert hydrocarbon diluent. Preparation of the bark to be joined to the rootstock. This piece of bark is often termed as either a bud patch, chip, or shield piece. Human translations with examples: falx, குறிச்சொல், what about you, nh தமிழ் பொருள், cme tamil பொருள். [33] Suggest a better translation The tacticity of polypropylene can be chosen by the choice of an appropriate catalyst. These catalysts are activated with special cocatalysts containing an organoaluminum compound such as Al(C2H5)3 and the second type of a modifier. This method of plant propagation has the advantage of producing numerous clones from a single piece of stem or twig, each node being a potential source of one-budded scion. There are various ready-to-use wrapping materials. The related techniques of blow molding and injection-stretch blow molding are also used, which involve both extrusion and molding. [39] These complexes are converted to polymerization catalysts by activating them with a special organoaluminum cocatalyst, methylaluminoxane (MAO). Definition of polypropylene in the Fine Dictionary. [32], Polypropylene is liable to chain degradation from exposure to temperatures above 100 °C. Basic Procedures Any of various thermoplastic polymers of propylene. Various techniques are used, mostly applicable to young plants in active growth with stems in which the bark is easily separable from the wood. 2. Likewise, wrapping materials that take time to deteriorate, like PP plastic strips, must be removed at the earliest time possible to prevent strangling effect. [58] Due to the above-mentioned propensity for polypropylene mesh to erode the tissue surrounding it, the FDA has issued several warnings on the use of polypropylene mesh medical kits for certain applications in pelvic organ prolapse, specifically when introduced in close proximity to the vaginal wall due to a continued increase in number of mesh-driven tissue erosions reported by patients over the past few years. Similarly, the resulting plants in general have shortened stature and maturity as compared to plants propagated from seed. Polypropylene sheets are a popular choice for trading card collectors; these come with pockets (nine for standard-size cards) for the cards to be inserted and are used to protect their condition and are meant to be stored in a binder. Polypropylene in hindi. Its most common medical use is in the synthetic, nonabsorbable suture Prolene, manufactured by Ethicon Inc. Correct polarity should be observed, that is, the patch of bark is oriented upward. The availability of sheet polypropylene has provided an opportunity for the use of the material by designers. A particularly important one is polypropylene random copolymer (PPR or PP-R), a random copolymer with polyethylene used for plastic pipework. It is easy to coat, print and laminate to give the required appearance and properties for use as a packaging material. Last Update: 2020-08-25 It also includes debudding and desuckering, the removal of offshoots that may emerge from the stem below the union. But for practical usage, a thin, transparent polypropylene (PP) plastic bag can be cut into strips about 2-3 cm wide. A specialized wrapping strip made of rubber expands as the rootstock grows and naturally deteriorates after several weeks. Pronunciation of polypropylene with 1 audio pronunciation, 4 synonyms, 11 translations and more for polypropylene. polyester translation in English-Tagalog dictionary. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.Its properties are similar to polyethylene, but it is slightly harder and more heat resistant. Cut back is done when it becomes certain that there is union which may take 15 days or more. Budsticks, small stems or twigs having multiple number of nodes from which the bud-containing barks are to be prepared, are obtained from well selected vigorous, disease-free mother plants having desirable characteristics and immediately defoliated. The light-weight, durable, and colorful plastic makes an ideal medium for the creation of light shades, and a number of designs have been developed using interlocking sections to create elaborate designs. This is because it emits less smoke and no toxic halogens, which may lead to production of acid in high-temperature conditions. Polypropylene is produced by the chain-growth polymerization of propene: The industrial production processes can be grouped into gas phase polymerization, bulk polymerization and slurry polymerization. Microplastics release is higher with warmer liquids and similar with other polypropylene products such as lunchboxes. In June 2016, a study showed that a mixture of polypropylene and durable superoleophobic surfaces created by two engineers from Ohio State University can repel liquids such as shampoo and oil. Commercial synthesis of syndiotactic polypropylene is carried out with the use of a special class of metallocene catalysts. Polypropylene definition: Polypropylene is a strong, flexible artificial material that is used to make things such... | Meaning, pronunciation, translations and examples This piece of bark is often termed as either a bud patch, chip, or shield piece. The advocacy organization Environmental Working Group classifies PP as of low to moderate hazard.[66][why?] polypropylene synonyms, polypropylene pronunciation, polypropylene translation, English dictionary definition of polypropylene. Basic Procedures polypropylene definition: 1. a type of plastic used for many purposes, such as food packaging, making ropes, and making…. Potted seedlings are widely used but, similar to grafting, established trees may be top-budded. Polypropylene is most commonly used for plastic moldings, wherein it is injected into a mold while molten, forming complex shapes at relatively low cost and high volume; examples include bottle tops, bottles, and fittings. Some experimentation may be required. This was reported as the first time this material was used in this scale in buildings. Rootstocks about the size of an ordinary pencil (~0.8 cm) and up to ~1.5 cm in diameter are commonly used but there are no hard rules. 5. 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