1. Qalabka taayirrada poliurethane waa mid jilicsan, oo leh iska caabin wanaagsan oo buuqa iyo qaylada hoose;halka taayirrada naylon ay xoogaa adag yihiin, iska caabintooduna ay wax yar ka duwan tahay kan polyurethane.Tusaale ahaan, dharka ka samaysan naylon sidoo kale waa u adkaysta.
2. Qalabka taayirrada poliurethane iyo taayirrada nylon way kala duwan yihiin.Polyurethane waa polymerized laga soo qaaday isocyyanates ( monomers) iyo xeryahooda hydroxyl.Sababtoo ah kooxda carbamate polar xooggan, oo aan lagu milmi karin kooxaha aan dabaylaha ahayn, waxay leedahay caabbinta saliidda wanaagsan, adkaanta, xirashada caabbinta, caabbinta gabowga iyo adhesion.Alaabta ku habboon heerkul ballaadhan (-50 ilaa 150°C) waxa laga diyaarin karaa walxo cayriin oo kala duwan, oo ay ku jiraan elastomers, resins thermoplastic iyo resins heerkulbeeye.Uma adkeysaneyso hydrolysis heerkulka sare, ama dhexdhexaadka alkaline.Naylon waa erey guud oo loogu talagalay polymers ka kooban kooxaha amide ee qaybta soo noqnoqda ee silsiladda weyn ee makromolecular.Polyamides waxaa lagu diyaarin karaa giraanta-furitaanka polymerization of lactams, ama polycondensation of diamines iyo dibasic acids.
Waqtiga boostada: Dec-23-2022