Thermoplastic vs Thermoset

Thermoplastic vs Thermoset

I-Thermoplastic ibhekisa kwipropati enokuthi ihambe kwaye ikhubazeke xa ishushu, kwaye inokugcina imilo ethile emva kokupholisa. Uninzi lwee-polymers ezihambelanayo zibonisa i-thermoplasticity kwaye zisetyenzwa ngokulula nge-extrusion, inaliti okanye ukubumba ukuvuthela. I-Thermosetting ibhekisa kwipropati engenakuthanjiswa kwaye ibunjwe repexa ishushu, kwaye ayinakunyibilika kwizinyibilikisi. Iipholima ezininzi zinempahla.

I-Thermosetting lutshintsho lweekhemikhali. Emva kokufudumala, isakhiwo siye satshintsha kwaye sajika saba enye into. Umzekelo, awukwazi ukubuyisela iqanda emva kokuba liphekiwe. I-Thermoplasticity lutshintsho lomzimba. Kuphela nje imeko yezinto eziphathekayo iyatshintsha xa ishushu, kodwa isakhiwo asitshintshi. Iseyinzalelwane. Ngokomzekelo, xa ikhandlela linyibilikiswa bubushushu, linokubuyiselwa kwikhandlela lokuqala, kodwa ukuvutha kwekhandlela kukutshintsha kwemichiza.

1. Thermoplastics

Ibathambile kwaye ibemanzi xa ishushu, kwaye iqina xa ipholile. Le nkqubo ibuyiselwa umva kwaye ingaba yi-repeated. Polyethylene, polypropylene, i-polyvinyl chloride, i-polystyrene, i-polyoxymethylene, i-polycarbonate, i-polyamide, iplastiki ye-acrylic, enye i-polyolefins kunye ne-copolymers yazo, i-polysulfide, i-polyphenylene ether, i-polyether ye-chlorinated, njl. I-thermoplastic. I-resin molecular chain kwi-thermoplastics yonke i-linear okanye i-branched. Akukho bhondi yeekhemikhali phakathi kwamatyathanga emolekyuli, kwaye ayathamba kwaye ahambe xa eshushu. Inkqubo yokupholisa kunye nokuqina lutshintsho lomzimba.

2. Iiplastiki zeThermosetting

Xa ishushu okokuqala, inokuthamba kwaye ihambe. Xa ifudunyezwa kubushushu obuthile, ikhemikhali isabela kwi-cross-link kwaye iqine ukuze iqine. Olu tshintsho alunakuguqulwa. Emva koko, xa ifudunyezwa kwakhona, ayinakuphinda ithambile kwaye ihambe. Kungenxa yolu phawu ukuba inkqubo yokubumba iqhutywe, kwaye ukuhamba kweplastiki ngexesha lokufudumeza kokuqala kusetyenziselwa ukuzalisa i-cavity phantsi koxinzelelo, kwaye emva koko kuqiniswe kwimveliso yesimo esinqunyiwe kunye nobukhulu. Esi sixhobo sibizwa ngokuba yi-thermoset.

I-resin yeeplastiki ze-thermosetting inomgca okanye i-branched ngaphambi kokunyanga. Emva kokunyanga, iibhondi zeekhemikhali zenziwa phakathi kwamatyathanga eemolekyuli ukuze zenze ulwakhiwo lwenethiwekhi olunamacala amathathu. Ayinakunyibilika nje kuphela, kodwa ayinakunyibilika kwizinyibilikisi. I-Phenolic, i-aldehyde, i-melamine formaldehyde, i-epoxy, i-polyester engaxutywanga, i-silicone kunye nezinye iiplastiki zonke ziplastiki ze-thermosetting.

Thermoplastic vs Thermoset