Kodi kutentha kwa galasi-transition (Tg) kwa ufa wa polima wotayikanso ndi kotani?

Kutentha kwa galasi-kusintha (Tg) kwa ufa wopangidwanso wa polima kumatha kusiyana kutengera kapangidwe ka polima ndi kapangidwe kake. Redispersible polima ufa nthawi zambiri amapangidwa kuchokera ku ma polima osiyanasiyana, kuphatikiza ethylene-vinyl acetate (EVA), vinyl acetate-ethylene (VAE), polyvinyl alcohol (PVA), acrylics, ndi ena. Polima iliyonse ili ndi Tg yakeyake, yomwe ndi kutentha komwe polima amasintha kuchokera ku magalasi kapena olimba kupita kumtundu wa rubbery kapena viscous state.

The Tg ya redispersible polima ufa amatengera zinthu monga:

1. Mapangidwe a Polima: Ma polima osiyanasiyana amakhala ndi ma Tg osiyanasiyana. Mwachitsanzo, EVA nthawi zambiri imakhala ndi Tg yoyambira -40 ° C mpaka -20 ° C, pomwe VAE imatha kukhala ndi Tg yosiyana -15 ° C mpaka 5 ° C.
2. Zowonjezera: Kuphatikizika kwa zowonjezera, monga mapulasitiki kapena ma tackifiers, kumatha kukhudza Tg ya ufa wopangidwanso wa polima. Zowonjezera izi zitha kutsitsa Tg ndikuwonjezera kusinthasintha kapena kumamatira.
3. Kukula kwa Particle ndi Morphology: Kukula kwa tinthu tating'ono ndi kapangidwe ka ma polima opangidwanso amathanso kukhudza Tg. Tinthu tating'onoting'ono tating'onoting'ono tating'onoting'ono titha kuwonetsa matenthedwe osiyanasiyana poyerekeza ndi tinthu tating'onoting'ono.
4. Njira Yopangira: Njira yopangira yomwe imagwiritsidwa ntchito popanga ufa wa polima wotayikanso, kuphatikiza njira zowumitsa ndi masitepe pambuyo pochiritsa, zitha kukhudza Tg ya chinthu chomaliza.

Pazifukwa izi, palibe mtengo umodzi wa Tg pamafuta onse opangidwanso polima. M'malo mwake, opanga nthawi zambiri amapereka zidziwitso ndi zidziwitso zaukadaulo zomwe zimaphatikizapo zambiri zamapangidwe a polima, mtundu wa Tg, ndi zina zomwe zimafunikira pazogulitsa zawo. Ogwiritsa ntchito ufa wa polima wotayikanso akuyenera kuwona zolembazi kuti adziwe zenizeni za Tg ndi zidziwitso zina zofunika zokhudzana ndi ntchito zawo.