钛酸酯偶联剂对聚乳酸/3-羟基丁酸同4-羟基丁酸共聚酯/纳米羟基磷灰石共混体系流变行为的影响  

Influence of Titanate Coupling Agent on Rheological Properties of PLA/PHA/Nanometer HA Blends

作　　者：梁多平[1] 智慧[1] 孙智慧[1] 张彪[2] 胡更生[2] 刘晓华 旺盛超 

机构地区：[1]哈尔滨商业大学轻工学院,黑龙江哈尔滨150028 [2]杭州电子科技大学中央与地方共建绿色包装材料实验室,浙江杭州310018 [3]黑龙江省塑料工业科学研究所,黑龙江哈尔滨150001

出　　处：《高分子材料科学与工程》2013年第12期86-89,93,共5页Polymer Materials Science & Engineering

基　　金：黑龙江省教育厅项目(12531171);黑龙江省重点自然科学基金资助项目(ZD201106)

摘　　要：采用异丙基三(二辛基焦磷酸酰氧基)钛酸酯偶联剂对纳米羟基磷灰石(HA)改性,再与聚乳酸(PLA)/聚(3-羟基丁酸酯-co-4-羟基丁酸酯)(PHA)熔融共混法制备PLA/PHA/HA纳米复合降解材料。利用流变仪对其流变行为进行了研究。结果表明,PLA/PHA基体在没有添加钛酸酯偶联剂和纳米HA时,基体储存模量G′和复数黏度η*随温度升高而逐渐降低;纯的纳米HA的加入可以提高PLA/PHA基体的储存模量G′和损耗模量G″,然而,PLA/PHA/HA纳米复合降解材料引入钛酸酯偶联剂反而会使储存模量G′和损耗模量G″降低。当过量引入钛酸酯偶联剂会明显降低体系线性-非线性转变的临界应变。在190℃,PLA/PHA基体加入纯的纳米HA时,储存模量G′升高,引入钛酸酯偶联剂后,基体储存模量G′反而有一定降低,但所有样品至少在30min内能保持较稳定的线性粘弹行为。Lvopropyl tri （dioctylpyrophosphate） titanate modified nanometer hydroxyapatite （HA） and poly （lactic / acid） （PLA） poly（a-hydroxybutyrate-co-4-hydroxybutyrate） （PHB） were used to prepare degradable PLA/PHB/HA composite by melting mixing method. The theological behavior and creep behavior were researched by the rheometer. The rheological behavior of the blends reveals that the storage modulus G＇ and complex viscosity rr of PLA/PHA substrate without titanate coupling agent and nano HA gradually decrease when the temperature rises. The addition of nano HA can enhance the storage modulus G＇ and loss modulus G. However, the addition of titanate coupling agent can weaken the storage modulus G＇ and loss modulus G of the degradable PLA/PHB/HA composite. The excessive addition of titanate coupling agent and nano HA would reduce the critical straiin of the transformation from linearity to nonlinearity. When nano HA was added into PLA/PHA substrate at 190 ℃, the storage modulus G＇ increases. When the titanate coupling agent was added into PLA/PHA substrate, the storage modulus G＇ decreases in some extent. All the samples can keel） a relatively stable linear viscoelastic behavior for at least 30min.

关 键 词：聚乳酸 聚(3 羟基丁酸酯-CO-4-羟基丁酸酯) 纳米羟基磷灰石 钛酸酯偶联剂 流变行为 

分 类 号：O631.21[理学—高分子化学]