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About 60% crystallization is the upper limit for commercial products, with the exception of polyester fibers. [ clarification needed ] Transparent products can be produced by rapidly cooling molten polymer below the glass transition temperature (T g ) to form a non-crystalline amorphous solid . [ 34 ]
paper napkins, etc. These products are prevalent in fast food restaurants, takeaways , but also for airline meals . In private settings, this kind of disposable products has proven very popular with consumers who prefer easy and quick cleanup after parties, etc. [ 1 ]
BoPET (biaxially oriented polyethylene terephthalate) is a polyester film made from stretched polyethylene terephthalate (PET) and is used for its high tensile strength, [1] chemical stability, [1] dimensional stability, [2] transparency [1] reflectivity, and electrical insulation. [1] When metallized, it has [3] gas and moisture barrier ...
The melting point for average commercial low-density polyethylene is typically 105 to 115 °C (221 to 239 °F). These temperatures vary strongly with the type of polyethylene, but the theoretical upper limit of melting of polyethylene is reported to be 144 to 146 °C (291 to 295 °F). Combustion typically occurs above 349 °C (660 °F).
Textual evidence of paper napkins appears in a description of the possessions of the Yu family, from the city of Hangzhou. [ 9 ] Paper napkins were first imported to the US in the late 1800s but did not gain widespread acceptance until 1948, when Emily Post asserted, "It’s far better form to use paper napkins than linen napkins that were used ...
A polyester shirt Close-up of a polyester shirt SEM picture of a bend in a high-surface area polyester fiber with a seven-lobed cross section A drop of water on a water resistant polyester Polyesters can contain one ester linkage per repeat unit of the polymer, as in polyhydroxyalkanoates like polylactic acid , or they may have two ester ...
The monofunctional reactant not only limits polymerization but end-caps the oligomer with functional groups capable of subsequent reaction to achieve curing of the oligomer. Functional groups like alkyne, norbornene, maleimide, nitrite, and cyanate have been used for this purpose. Maleimide and norbornene end-capped oligomers can be cured by ...
During this golden age of napkin folding, there was a school in Nuremberg devoted entirely to this art and butlers had shelves of instructional books to keep up with the changes in the field. [3] Napkin folding in the form of table sculptures began being replaced by porcelain decorations during the 18th century.