Diversity-Oriented Synthesis of Graft Copolymer Silicones Enables Exceptionally Broad Thermomechanical Property Windows through Pendant-Mediation
Keith E. L. HustedAbraham Herzog‐ArbeitmanDenise KleinschmidtWenxu ZhangAlyssa J. FielitzAn N. LeMingjiang ZhongJeremiah A. Johnson
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Abstract Graft copolymers offer a versatile platform for the design of self-assembling materials; however, simple strategies for precisely and independently controlling the thermomechanical and morphological properties of graft copolymers over wide property windows remain elusive. Here, using a library of 92 systematically varied polynorbornene-graft-polydimethylsiloxane (PDMS) copolymers, we discover a versatile backbone-pendant sequence control strategy that overcomes this challenge. We find that small structural variations of aliphatic pendant groups, e.g., cyclohexyl versus n-hexyl, of small molecule comonomers have dramatic impacts on the order-to-disorder transitions, glass transitions, mechanical properties, and self-assembled morphologies of statistical and block silicone-based graft copolymers, providing an exceptionally broad palette of designable materials properties, e.g., elastic moduli that vary over 9 orders-of-magnitude. For example, statistical graft copolymers with very high PDMS volume fractions yielded unbridged body-centered cubic (BCC) morphologies that behaved as ultra-soft, shear-thinning, plastic crystals. By contrast, lamellae-forming statistical graft copolymers provided robust, stiff, yet reprocessable silicone thermoplastics (TPs) with transition temperatures spanning over 160 °C and elastic moduli as high as 150 MPa, which is much greater than commercial silicone thermosets. Altogether, this study reveals a new pendant-mediated assembly strategy that simplifies graft copolymer synthesis and enables access to a diverse family of silicone materials, setting the stage for the broader development of self-assembling materials with tailored performance specifications.Keywords:
Polydimethylsiloxane
Sequence (biology)
Particle (ecology)
Transition temperature
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Emulsifing ability of Polyoxyethylenemodified-polydimethylsiloxane (POES) in Silicone-Water system was investigated.9 kinds of POES were synthesized by addition reaction of SiH and CH2=CH-in the presence of Platinum catalyst. These were devided into 3 type by molecule structure, Polyoxyethylene (A)-Polydimethylsiloxane (B) linear block copolymer, A-B-A linear block copolymer and branched copolymer with side chain of A. Emulsifing ability of these POES was evaluated by observing the physical appearance of the mixture of each Silicone and Water with 4% of POES.Some of A-B and A-B-A linear copolymer showed higher emulsifing ability than branched copolymer. These copolymers are considered as promising emulsifier for silicone.
Polydimethylsiloxane
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The current modification of polydimethylsiloxane (PDMS) substrates via oxygen plasma treatment causes surface cracks. Here, we demonstrate a method to prevent crack formation by chemical treatment. Chemical modification renders the surface hydrophilic for several days and is effective in preserving the elasticity of the PDMS surface at the nanoscale level.
Polydimethylsiloxane
Surface Modification
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The formation of self-cleaning functions on silicone elastomers is crucial for practical applications but still challenging.
Polydimethylsiloxane
Silicone Elastomers
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我们建议了制作在这的 microfluidic 薄片聚合物主人模子糊的 polydimethylsiloxane (PDMS ) 的一个新奇方法。方法主要包括二步。首先，不锈钢片是蚀刻形成一个金属模型的激光。然后，器官的解决方案(甲基 methacrylate )(PMMA ) poly 是 casted 到金属模型上制作将随后被用来制作 PDMS 芯片的 PMMA 主人。我们系统地研究了影响 microchannels 的表面地位的不同激光参数并且获得了优化蚀刻的参数。当扔的薄片掌握时，我们调查了并且优化，并且开发了一个方法用二个不同粘性答案形成好聚合物主人接着扔模型，并且学习可重复的复制 PMMA 的器官的答案作文。然后，我们调查了这块芯片的物理性能并且由分析玫瑰精 B 评估了有实行可能。与现在的方法相比，建议方法不在 photoresistant 并且化学蚀刻上需要影印石版术。全部制作进步简单，快便宜并且能容易被控制。仅仅几分钟被要求为 PDMS 薄片做一个金属模型，为一位 PMMA 主人的 3 个小时，和一天。
Polydimethylsiloxane
PDMS stamp
Microfluidic chip
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The properties of copolymerization of D F 3, D 4 were studied . It is a balancing copolymerization with opening cycloes. The produce rate of copolymer and high copolymer is almost constant when it is balanced. As for the discovery of alkaline catalyst, strong catalyst is good for producing copolymer of high molecular weight. Owing to the rise of temperature, the copolymerization speeds up, molecular weight of the copolymer decreases down, and it forms a relationship of ln ~1/ T . At the beginning of copolymerizing, to rise the temperature, and then, to reduce it. The purpose of shortening the time of copolymerization and increasing the molecular weight of copolymer can be got.
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Polydimethylsiloxane is a translucent and biologically inert silicone material used in sealants, biomedical implants and microscale lab-on-a-chip devices. Furthermore, in membrane technology, polydimethylsiloxane represents a material for separation barriers as it has high permeabilities for various gases. The facile handling of two component formulations with a silicone base material, a catalyst and a small molecular weight crosslinker makes it widely applicable for soft-lithographic replication of two-dimensional device geometries, such as microfluidic chips or micro-contact stamps. Here, we develop a new technique to directly print polydimethylsiloxane in a rapid prototyping device, circumventing the need for masks or sacrificial mold production. We create a three-dimensional polydimethylsiloxane membrane for gas–liquid-contacting based on a Schwarz-P triple-periodic minimal-surface, which is inaccessible with common machining techniques. Direct 3D-printing of polydimethylsiloxane enables rapid production of novel chip geometries for a manifold of lab-on-a-chip applications.
Polydimethylsiloxane
Microscale chemistry
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A procedure is described for making layer-to-layer interconnections in polydimethylsiloxane (PDMS) microfluidic devices. Thin (∼50 μm) perforated PDMS membranes are bonded to thicker (0.1 cm or more) PDMS slabs by means of thermally cured PDMS prepolymer to form a three-dimensional (3D) channel structure, which may contain channel or valve arrays that can pass over and under one another. Devices containing as many as two slabs and three perforated membranes are demonstrated. We also present 3D PDMS microfluidic devices for display and for liquid dispensing.
Polydimethylsiloxane
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In this work a two-part polydimethylsiloxane (PDMS) ink has been developed, printed individually, and cured. The successful printing of PDMS has been used to fabricate complex 3D geometry for the first time using FRIJP.
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