Renewable, Degradable, and Chemically Recyclable Cross-Linked Elastomers
Renewable, Degradable, and Chemically Recyclable Cross-Linked Elastomers
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DOI：
10.1021/acs.iecr.6b02931
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发表时间：
2016-10-26
影响因子：
4.2
通讯作者：
Hillmyer, Marc A.
中科院分区：
文献类型：
--
作者：
Brutman, Jacob P.;De Hoe, Guilhem X.;Hillmyer, Marc A.
以硫化天然橡胶为代表的大多数商用弹性体都是交联型聚合物，因此不容易再加工或回收。虽然有些来自可再生资源，但大多数来自石油原料，不容易降解。在本研究中，采用两种不同的方法制备了基于β-甲基-三角洲-戊内酯的可再生弹性体：(1)与双(六元环碳酸酯)串联共聚/交联；(2)用自由基生成物对线性聚(β-甲基-三角洲-戊内酯)均聚物进行交联。研究了这些材料的机械性能；观察到抗拉强度高达12兆帕，伸长率高达2000%。加入填充物(气相白炭黑)可以在不显著损失弹性的情况下提高弹性体的性能，一些复合材料的拉伸强度几乎是纯弹性体的两倍。水相降解研究表明，这些材料能够在60℃的酸性和碱性条件下降解。此外，这些交联弹性体还可以进行化学循环，以高纯度和高产率(>；分别为91%和93%)产生单体。
Most commercial elastomers, typified by vulcanized natural rubber, are cross-linked polymers and as such cannot easily be reprocessed or recycled. While some are derived from renewable resources, the majority are produced from petroleum feedstocks and do not easily degrade. In this study, renewable elastomers based on beta-methyl-delta-valerolactone were produced using two different methodologies: (1) tandem copolymerization/cross-linking with a bis(six-membered cyclic carbonate); (2) cross-linking of a linear poly(beta-methyl-delta-valerolactone) homopolymer with a free-radical generator. The mechanical properties of these materials were investigated; tensile strengths of up to 12 MPa and elongations of up to 2000% were observed. Inclusion of a filler (fumed silica) was used to enhance the performance of the elastomers without significant loss of elasticity, with some composites exhibiting tensile strengths nearly double that of the neat elastomer. Aqueous degradation studies indicated that the materials were capable of degradation in acidic and basic conditions at 60 degrees C. Moreover, these cross-linked elastomers can also be chemically recycled, yielding monomer in high purity and yield (>91% and 93%, respectively).