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 repei-atedly lapho ishisa, futhi ayikwazi ukuncibilika ezincibilikisini. 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 ibe uketshezi uma ishisisiwe, futhi iqina lapho ipholile. Le nqubo iyabuyiseleka emuva futhi ingaba ngu-repeated. I-polyethylene, i-polypropylene, i-polyvinyl chloride, i-polystyrene, i-polyoxymethylene, i-polycarbonate, i-polyamide, ipulasitiki ye-acrylic, amanye ama-polyolefin nama-copolymers awo, i-polysulfide, i-polyphenylene ether, i-chlorinated polyether, njll. I-thermoplastic. Amaketanga e-resin molecular in thermoplastics wonke aqondile noma anegatsha. Akukho sibopho samakhemikhali phakathi kwamaketanga amangqamuzana, futhi ayathamba futhi ageleze lapho kushisa. Inqubo yokupholisa nokuqiniswa kuwushintsho lomzimba.

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