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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Dual stimuli-responsive polymers derived from α-amino acids: Effects of molecular structure, molecular weight and end-group
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Dual stimuli-responsive polymers derived from α-amino acids: Effects of molecular structure, molecular weight and end-group

机译:源自α-氨基酸的双重刺激响应聚合物:分子结构,分子量和端基的影响

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摘要

Four kinds of well defined poly(N-methacryloyl-L-amino acid)s were prepared via reversible addition fragmentation chain transfer polymerization. The effects of molecular structure, molecular weight, and end-group on their responsive properties in water were investigated. We found that the monomer structure is critical for the polymer to exhibit stimuli-responsive properties in water; only polymers derived from aspartic acid showed defined dual thermo- and pH-responsive properties. To study the effects of molecular weight and end group on the lower critical solution temperature behavior of poly(N-methacryloyl-L-β-isopropyl aspartic acid) (PMAIPAC), a series of PMAIPAC homopolymers with controlled molecular weights and narrow polydispersities were prepared and treated with excess radical initiators to give defined end groups. The cloud point of PMAIPAC was found to increase with the increase of solution pH, due to the ionization of carboxylic acid groups, and decrease with the increase of molecular weight. The structure of end groups also affects the cloud point of PMAIPAC particularly for low molecular weight samples at low pH.
机译:通过可逆加成断裂链转移聚合反应制备了四种定义明确的聚(N-甲基丙烯酰基-L-氨基酸)。研究了分子结构,分子量和端基对其在水中响应特性的影响。我们发现,单体结构对于聚合物在水中表现出刺激响应特性至关重要。仅衍生自天冬氨酸的聚合物显示出确定的热响应和pH响应双重特性。为了研究分子量和端基对聚(N-甲基丙烯酰基-L-β-异丙基天冬氨酸)(PMAIPAC)的较低临界溶液温度行为的影响,制备了一系列分子量可控且窄分散性的PMAIPAC均聚物并用过量的自由基引发剂处理,得到确定的端基。发现PMAIPAC的浊点由于羧酸基团的电离而随着溶液pH的增加而增加,并且随着分子量的增加而降低。端基的结构也会影响PMAIPAC的浊点,尤其是对于低pH下的低分子量样品而言。

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