Liyini izinga lokushisa lengilazi (Tg) lamampushana e-polymer ahlakazeka kabusha?

Izinga lokushisa le-glass-transition (Tg) lamampushana e-polymer ahlakazeka kabusha lingahluka kuye ngokwakhiwa kwe-polymer ethile kanye nokwakheka. Izimpushana ze-polymer ezihlakazeka kabusha zivame ukukhiqizwa kuma-polymers ahlukahlukene, kufaka phakathi i-ethylene-vinyl acetate (EVA), i-vinyl acetate-ethylene (VAE), i-polyvinyl alcohol (PVA), ama-acrylics, nokunye. I-polymer ngayinye ine-Tg yayo ehlukile, okuyizinga lokushisa lapho i-polymer ishintsha khona isuka esimweni esiyingilazi noma esiqinile iye esimweni se-rubbery noma se-viscous.

I-Tg yama-polymer powders ahlakazeka kabusha ithonywa izici ezifana nalezi:

1. Ukubunjwa kwePolymer: Ama-polymer ahlukene anamanani ahlukene we-Tg. Isibonelo, i-EVA ngokuvamile inobubanzi be-Tg obungaba ngu-40°C kuya ku-20°C, kuyilapho i-VAE ingase ibe nebanga le-Tg elicishe libe ngu--15°C kuya ku-5°C.
2. Izengezo: Ukufakwa kwezithasiselo, njengamapulasitiki noma izithasiselo, kungathinta i-Tg yezimpushana ze-polymer ezihlakazeka kabusha. Lezi zengezo zingase zehlise i-Tg futhi zithuthukise ukuguquguquka noma izici zokunamathela.
3. Usayizi Wezinhlayiyana Ne-Morphology: Usayizi wezinhlayiyana kanye ne-morphology yezimpushana ze-polymer ezihlakazeka kabusha nazo zingathonya i-Tg yazo. Izinhlayiya ezincane zingabonisa izici ezishisayo ezihlukene uma kuqhathaniswa nezinhlayiya ezinkulu.
4. Inqubo Yokukhiqiza: Inqubo yokukhiqiza esetshenziselwa ukukhiqiza izimpushana ze-polymer ezihlakazeka kabusha, okuhlanganisa izindlela zokomisa nezinyathelo zangemva kokwelashwa, ingaba nomthelela ku-Tg yomkhiqizo wokugcina.

Ngenxa yalezi zici, alikho inani le-Tg elilodwa lawo wonke ama-polymer powders ahlakazeka kabusha. Esikhundleni salokho, abakhiqizi ngokuvamile bahlinzeka ngezicaciso namaphepha edatha obuchwepheshe afaka ulwazi mayelana nokwakheka kwe-polymer, ububanzi be-Tg, nezinye izici ezifanele zemikhiqizo yabo. Abasebenzisi bezimpushana ze-polymer ezihlakazeka kabusha kufanele babheke la madokhumenti ngamavelu athile e-Tg nolunye ulwazi olubalulekile oluhlobene nezicelo zabo.