Thermoplastic vs Thermoset

Thermoplastic vs Thermoset

I-Thermoplastic ibhekisa kwipropati enokuthi ihambe kwaye ikhubazeke xa ishushu, kwaye inokugcina imilo ethile emva kokupholisa. Uninzi lweepolymers ezinemigca zibonisa i-thermoplasticity kwaye zisetyenzwa ngokulula nge-extrusion, inaliti okanye ukubumba ukuvuthela. I-Thermosetting ibhekiselele kwipropati engenako ukuthanjiswa kwaye ibunjwe ngokuphindaphindiweyo xa 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

Iba thambile kwaye ibe manzi xa ifudunyezwa, kwaye iqine xa ipholile. Le nkqubo iyakwazi ukutshintshwa kwaye inokuphindwa. I-Polyethylene, i -polypropylene , i-polyvinyl chloride, i-polystyrene, i-polyoxymethylene, i-polycarbonate, i-polyamide, i-acrylic plastic, ezinye ii-polyolefins kunye nee-copolymers zazo, i-polysulfide, i-polyphenylene ether, i-chlorinated polyether, njl. Yi-thermoplastic. Ii-resin molecular chains kwi-thermoplastics zonke zi-linear okanye zi-branched. Akukho khonkco leekhemikhali phakathi kwee-molecular chains, kwaye ziyathamba kwaye zihambe xa zifudunyezwa. Inkqubo yokuphola kunye nokuqina yinguqu ebonakalayo.

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