I-Thermoplastic vs Thermoset

I-Thermoplastic vs Thermoset

I-Thermoplastic isho indawo into engageleza futhi yonakale lapho ishiswa, futhi ingagcina umumo othile ngemva kokupholisa. Ama-polymers amaningi aqondile abonisa i-thermoplasticity futhi acutshungulwa kalula nge-extrusion, umjovo noma ukubunjwa kokushaywa. I-Thermosetting ibhekisela esakhiweni esingakwazi ukuthanjiswa futhi sibunjwe ngokuphindaphindiwe lapho sishiswa, futhi asikwazi ukuncibilika kuzincibilikisi. Ama-polymer amaningi analesi sakhiwo.

I-Thermosetting ingushintsho lwamakhemikhali. Ngemva kokushiselwa, isakhiwo sishintshile futhi saphenduka enye into. Isibonelo, awukwazi ukubuyisela iqanda ngemva kokuba seliphekiwe. I-Thermoplasticity yinguquko yomzimba. Ukuthi nje isimo sempahla siyashintsha lapho kushisa, kodwa isakhiwo asishintshi. Kuseyindabuko. Ngokwesibonelo, lapho ikhandlela lincibilika ngenxa yokushisa, lingabuyiselwa ekhandlelani lokuqala, kodwa ukuvutha kwekhandlela kuwukushintsha kwamakhemikhali.

1. I-Thermoplastics

Iba thambile futhi imanzi uma ishiswa, futhi iqine uma ipholisiwe. Le nqubo iyakwazi ukuguquka futhi ingaphindeka. I-Polyethylene, i-polypropylene , i-polyvinyl chloride, i-polystyrene, i-polyoxymethylene, i-polycarbonate, i-polyamide, i-acrylic plastic, amanye ama-polyolefin kanye nama-copolymer awo, i-polysulfide, i-polyphenylene ether, i-chlorinated polyether, njll. Iyi-thermoplastic. Amaketanga e-resin molecular kuma-thermoplastics wonke aqondile noma ahlanganisiwe. Akukho sibopho samakhemikhali phakathi kwamaketanga e-molecule, futhi ayathamba futhi ageleze lapho eshiswa. Inqubo yokupholisa nokuqinisa iwushintsho olungokwenyama.

2. Amapulasitiki e-thermosetting

Uma ifudumala okokuqala, ingathamba futhi igeleze. Lapho ishiselwa ezingeni elithile lokushisa, ukusabela kwamakhemikhali kwenzeka ukuze ihlangane futhi iqine ukuze iqine. Lolu shintsho aluhlehliseki. Ngemva kwalokho, lapho isishisisiwe futhi, ngeke isakwazi ukuthamba futhi igeleze. Kungenxa yalesi sici ukuthi inqubo yokubumba yenziwa, futhi ukugeleza kwepulasitiki ngesikhathi sokushisa kokuqala kusetshenziselwa ukugcwalisa umgodi ngaphansi kwengcindezi, bese kuqina kube umkhiqizo wesimo esinqunyiwe nobukhulu. Le nto ibizwa ngokuthi i-thermoset.

I-resin yepulasitiki ye-thermosetting iqondile noma ifakwe amagatsha ngaphambi kokwelashwa. Ngemva kokuphulukisa, izibopho zamakhemikhali ziyakhiwa phakathi kwamaketanga amangqamuzana ukuze akhe isakhiwo senethiwekhi esinezinhlangothi ezintathu. Akukhona nje kuphela ukuthi ngeke kuphinde kuncibilike futhi, kodwa ngeke kuncibilike ezincibilikisini. I-Phenolic, i-aldehyde, i-melamine formaldehyde, i-epoxy, i-polyester engagcwaliswanga, i-silicone namanye amapulasitiki angamapulasitiki ashisayo.

I-Thermoplastic vs Thermoset