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haizhoubuer新蟲 (初入文壇)
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[求助]
親們,江湖告急,求翻譯!
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| When the swelling reaches a particular extent, the network expansion power became much smaller, and the complexing action of COO− on the resin graft chains with bivalent and trivalent metal cation causes the graft chains that cross-link the resin network structure to shrink (Pourjavadi, Amini- Fazl, & Hosseinzadeh, 2005; Hua & Wang, 2009). This result leads to the leakage of absorbed water; thus, a maximum in swelling with time was observed (Wang & Wang, 2010). The stability constant order of the complexes produced by bivalent and trivalent metal ions with COO− is greater for Ca2+ than in Al3+ because the stability of the complexes formed by bivalent and trivalent metal cations with the resin is much higher than that by monovalent cations (Zhao, Su, Fang, & Tan, 2005). The resin in bivalent and trivalent metal cation solutions exhibits overswelling. The ionic radius of Na+ is smaller than that of Ca2+ and Al3+ at the same plasma strength conditions, and the swelling capacity of the resin in Na+ is higher than in Ca2+ and Al3+. At concentrations from 0.01 mol/L to 0.1 mol/L, the swelling capacity of the resin was highest in NaCl (NaCl > CaCl2 > AlCl3). |
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當(dāng)膨脹達(dá)到一定程度時(shí),該網(wǎng)絡(luò)結(jié)構(gòu)向外擴(kuò)張的力將會(huì)小很多,而且樹脂枝鏈上的COO-鍵與二、三價(jià)金屬陽離子間的配位作用會(huì)導(dǎo)致與樹脂網(wǎng)絡(luò)間存在交叉耦合的枝鏈發(fā)生收縮。(后面是引用的文獻(xiàn)) 這會(huì)引起吸附水的滲出,這樣就可以在一定時(shí)間內(nèi)觀察到膨脹的最大量。 二價(jià)及三價(jià)金屬陽離子與COO-鍵間配位作用的穩(wěn)定性強(qiáng)弱順序?yàn)椋篊a2 高于Al3+,因?yàn)闃渲c二、三價(jià)金屬離子間的配位作用的穩(wěn)定性遠(yuǎn)強(qiáng)于與一價(jià)離子間的配位。 樹脂處在二價(jià)及三價(jià)金屬離子的溶液中時(shí)會(huì)出現(xiàn)過度膨脹。在相同的等離子強(qiáng)度下鈉離子的離子半徑遠(yuǎn)小于鈣離子和鋁離子,且樹脂在鈉離子(溶液)中的膨脹量遠(yuǎn)高于在鈣離子和鋁離子(的溶液)中的膨脹量。當(dāng)濃度由0.01mol/L增加到0.1mol/L時(shí),樹脂在氯化鈉中的膨脹量達(dá)到最大值(NaCl > CaCl2 > AlCl3)。 |
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