ʻO ka waiwai nui o ka hopena cellulose ether ʻo ia kona waiwai rheological. ʻO nā waiwai rheological kūikawā o nā cellulose ethers he nui e hoʻohana nui ʻia ai lākou i nā ʻano like ʻole, a ʻo ke aʻo ʻana i nā waiwai rheological he mea pono ia no ka hoʻomohala ʻana i nā kahua noi hou a i ʻole ka hoʻomaikaʻi ʻana i kekahi mau kahua noi. Ua hana ʻo Li Jing mai ke Kulanui ʻo Shanghai Jiao Tong i kahi noiʻi ʻōnaehana e pili ana i nā waiwai rheological okarboksimetilselulosa (CMC), me ka mana o nā ʻano hoʻonohonoho molekala o CMC (ke kaumaha molekala a me ke kekelē o ka hoʻololi ʻana), ka pH concentration, a me ka ikaika ionic. Hōʻike nā hopena noiʻi e piʻi ana ka viscosity zero-shear o ka hopena me ka piʻi ʻana o ke kaumaha molekala a me ke kekelē o ka hoʻololi ʻana. ʻO ka piʻi ʻana o ke kaumaha molekala ʻo ia hoʻi ka ulu ʻana o ke kaulahao molekala, a ʻo ka maʻalahi o ka entanglement ma waena o nā molekala e hoʻonui i ka viscosity o ka hopena; ʻo ke kekelē nui o ka hoʻololi ʻana e hoʻolōʻihi i nā molekala i loko o ka hopena. Aia ke kūlana, nui ka nui o ka hydrodynamic, a lilo ka viscosity i mea nui. Hoʻonui ka viscosity o ka hopena wai CMC me ka piʻi ʻana o ka concentration, nona ka viscoelasticity. Hoʻemi ka viscosity o ka hopena me ka waiwai pH, a i ka wā e haʻahaʻa ai ma mua o kekahi waiwai, hoʻonui iki ka viscosity, a i ka hopena ua hoʻokumu ʻia ka waikawa manuahi a hoʻoulu ʻia. He polymer polyanionic ʻo CMC, i ka wā e hoʻohui ai i nā ions paʻakai monovalent Na+, pale K+, e emi ana ka viscosity e like me ia. ʻO ka hoʻohui ʻana o ka divalent cation Caz+ e hoʻemi mua i ka viscosity o ka hopena a laila hoʻonui. Ke kiʻekiʻe aʻe ka nui o Ca2+ ma mua o ke kiko stoichiometric, launa pū nā molekala CMC me Ca2+, a aia kahi superstructure i loko o ka hopena. Ua hoʻohana ʻo Liang Yaqin, ke Kulanui ʻĀkau o Kina, a me nā mea ʻē aʻe i ke ʻano viscometer a me ke ʻano viscometer rotational e hana i kahi noiʻi kūikawā ma nā waiwai rheological o nā hopena dilute a me nā hopena i hoʻohui ʻia o ka hydroxyethyl cellulose i hoʻololi ʻia (CHEC). Ua ʻike ʻia nā hopena noiʻi: (1) Loaʻa i ka cationic hydroxyethyl cellulose ke ʻano viscosity polyelectrolyte maʻamau i ka wai maʻemaʻe, a piʻi ka viscosity i hoʻemi ʻia me ka piʻi ʻana o ka nui. ʻOi aku ka nui o ka viscosity intrinsic o ka cationic hydroxyethyl cellulose me ke kiʻekiʻe o ka pani ʻana ma mua o ka cationic hydroxyethyl cellulose me ke kiʻekiʻe haʻahaʻa o ka pani ʻana. (2) Hōʻike ka hopena o ka cationic hydroxyethyl cellulose i nā ʻano wai non-Newtonian a he mau ʻano lahilahi shear: i ka piʻi ʻana o ka nui o ka hopena, piʻi kona viscosity maopopo; i loko o kahi ʻano o ka hopena paʻakai, CHEC apparent viscosity Ua emi ia me ka piʻi ʻana o ka nui o ka paʻakai i hoʻohui ʻia. Ma lalo o ka helu ʻoki like, ʻoi aku ke kiʻekiʻe o ka mānoanoa o CHEC i ka ʻōnaehana hopena CaCl2 ma mua o CHEC i ka ʻōnaehana hopena NaCl.
Me ka hoʻomau ʻana o ka noiʻi a me ka hoʻonui mau ʻana o nā kahua noi, ua loaʻa pū ka manaʻo o ka poʻe i nā waiwai o nā hopena ʻōnaehana i hui pū ʻia me nā ʻea cellulose like ʻole. No ka laʻana, hoʻohana ʻia ka sodium carboxymethyl cellulose (NACMC) a me ka hydroxyethyl cellulose (HEC) ma ke ʻano he mau mea hoʻoneʻe ʻaila i nā kahua aila, nona nā pono o ke kūpaʻa ikaika o ka shear, nā mea maka he nui a me ka emi ʻana o ka haumia o ke kaiapuni, akā ʻaʻole kūpono ka hopena o ka hoʻohana ʻana iā lākou wale nō. ʻOiai he maikaʻi ka viscosity o ka mea mua, ua maʻalahi ka hoʻopilikia ʻia e ka mahana o ka waihona a me ka paʻakai; ʻoiai he maikaʻi ka pale ʻana o ka mahana a me ka paʻakai o ka mea hope, ʻaʻole maikaʻi kona hiki ke mānoanoa a nui ka nui. Ua hui pū nā mea noiʻi i nā hopena ʻelua a ua ʻike ʻia ua nui ka viscosity o ka hopena hui, ua hoʻomaikaʻi ʻia ke kūpaʻa o ka mahana a me ke kūpaʻa o ka paʻakai i kekahi ʻano, a ua hoʻonui ʻia ka hopena noi. Ua aʻo ʻo Verica Sovilj et al. i ke ʻano rheological o ka hopena o ka ʻōnaehana i hui pū ʻia me HPMC a me NACMC a me ka surfactant anionic me kahi viscometer rotational. ʻO ke ʻano rheological o ka ʻōnaehana e pili ana i ka HPMC-NACMC, HPMC-SDS a me NACMC- (HPMC-SDS) nā hopena like ʻole i hana ʻia ma waena.
Hoʻopilikia pū ʻia nā waiwai rheological o nā hopena cellulose ether e nā kumu like ʻole, e like me nā mea hoʻohui, ka ikaika mechanical waho a me ka mahana. Ua aʻo ʻo Tomoaki Hino et al. i ka hopena o ka hoʻohui ʻana o ka nicotine ma nā waiwai rheological o ka hydroxypropyl methylcellulose. Ma 25C a me kahi ʻano haʻahaʻa ma mua o 3%, ua hōʻike ʻo HPMC i ke ʻano wai Newtonian. I ka wā i hoʻohui ʻia ai ka nicotine, ua piʻi ka viscosity, kahi e hōʻike ana ua hoʻonui ka nicotine i ka entanglement oHPMCnā molekala. Hōʻike ka nikotine ma aneʻi i kahi hopena paʻakai e hoʻokiʻekiʻe ai i ke kiko gel a me ke kiko noe o HPMC. ʻO ka ikaika mechanical e like me ka ikaika shear e loaʻa pū kekahi mana i nā waiwai o ka cellulose ether aqueous solution. Ma ka hoʻohana ʻana i ka rheological turbidimeter a me ka mea hoʻopuehu kukui kihi liʻiliʻi, ua ʻike ʻia i loko o ka hopena semi-dilute, e hoʻonui ana i ka shear rate, ma muli o ka hui ʻana o ka shear, e piʻi aʻe ka mahana hoʻololi o ke kiko noe.
Ka manawa hoʻouna: ʻApelila-28-2024