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- It's caused by the micro phase separation degree of TPU is increased as well as the soft hard segment structure is perfected. 研究认为热处理提高了TPU的微相分离程度,完善了TPU中的软硬段结构。
- The effects of hard segment structure, hard segment content and chain extender with different structure on physical mechanical properties of dry films and water absorption were studied. 研究了不同硬段结构和硬段含量和扩链剂对其干膜物理机械性能和吸水率的影响。
- The miscibility of three kinds different soft segments (polycaprolactone, polypropylene oxide, polytetramethylene oxide) polyurethanes possessing the same hard segmental structure and content with PVC or CPVC blends were studied by DSC. 采用示差扫描量热法研究了相同硬段及含量的3种不同类型软段的聚氨酯与聚氯乙烯（PVC）、氯化聚氯乙烯（CPVC）的相容性。
- Keywords aqueous polyurethane dispersion;polyols containing ionic groups;hard segment structure;adhesive properties;dispersion technology; 水性聚氢酯分散液;含离子基团的多元醇;硬段结构;粘接性能;分散工艺;
- hard segment structure 硬段结构
- Objective To study the changes of the ocular anterior segment structure and the mechanism of angle-closure glaucoma after scleral buckling surgery. 目的观察巩膜环扎术后眼前节结构的变化,探讨术后继发性闭角型青光眼的发病机制。
- Nano-montmorillonite-aliphatic PU elastomer synthesized from HMDI, PTMG1000 and MMT2 with 40% mass fraction of hard segment possesses better mechanical properties. 以HMDI、PTMG1000和MMT2为原料,硬段质量分数为40%25时,所合成的纳米蒙脱土-脂肪族聚氨酯弹性体具有较好的力学性能。
- The effects of hard segment content on the microstructure and viscosity of polyether PU and PUU were studied by FT-IR, DSC, viscosimeter. 利用FT-IR,DSC,旋转黏度计研究了硬段含量对聚醚型PU和PUU的微观结构及黏度的影响。
- For these PUU aqueous dispersions, the particle size decreases with the increase of the hard segment content, but their stability is enhanced. 结果表明：随硬段含量的增加，PUU水分散液的粒径减小，稳定性增加，室温贮存期大于1年；
- Shape memory polyurethanes based on aliphatic diisocyanate HDI were synthesized with different hard segment contents to study the shape memory effect affected by hard segment. 以脂肪族异氰酸酯HD I为硬段原料合成了脂肪族的形状记忆聚氨酯,通过调节硬段含量研究了硬段结构对形状记忆性能的影响。
- When increasing hard segment content, the interaction between SPU moleculars is intensified whereas the miscibility of the blends in decreased consequently. 多嵌段聚氨酯硬段含量的增加，加强了SPU分子间的相互作用，同时也减小了共混物两组分的相容性。
- Characteristic chain segment structure composition and distribution and monomerchain segment distribution in VDF/CTFE copolymer were effectively characterizedand measured by using NMR and Py-GC/MS. 运用NMR和Py-GC/MS方法能有效地对VDF/CTFE共聚物中特征链节结构组成及分布和单体链节分布等进行表征和测定。
- The factors include relative molecular mass of PTMG, diisocyanates, chain extenders, mass fraction of hard segment, NCO mass fraction and chemical crosslink in prepolymer,etc. 讨论了化学结构因素对聚氨酯弹性体力学性能的影响,化学结构因素包括PTMG相对分子质量、二异氰酸酯、扩链剂、硬段质量分数、预聚体NCO基质量分数和化学交联等。
- Conclusion The repair of scleral rupture with anterior vitrectomy may prevent retina or choroid incarceration and create the chance of reconstruction of posterior segment structure. 结论前段玻璃体切除在巩膜裂伤修补中，有效地防止了视网膜或脉络膜的嵌顿，为进一步重建眼后段结构创造了基础。
- Abstract： The spherulite growth behaviour of hard segment has been studied by SALS and other techniques for polyester-polyether block copolymers with low hard segment content. 摘要： 采用SALS等方法研究了低硬段含量的聚酯-聚醚多嵌段共聚物中硬段结晶时的球晶生长规律。
- The results showed that in the case of having same ratio of soft to hard segment, both the PUD with ionic group in soft or hard segment had better stability. 结果表明，软、硬段比例相同的软段含离子PUD和硬段含离子PUD都具有良好的稳定性；
- The results show that the level of polysulfide polyurea and the content of hard segment in polysulfide polyurea influence the morphology, T_g and modulus of cured epoxy resin. 结果表明,液体聚硫聚脲齐聚物的用量、齐聚物中聚脲含量对固化后的环氧树脂玻璃化温度、模量及形态有较大影响。
- The interaction between the shield and segments and transverse isotropic characteristics of the segment structure are taken into consideration in the model. 模型中考虑了盾构机与管片衬砌的相互作用，以及管片衬砌结构的横观各向同性性质。
- It is hard to sleep without a cooler in this room. 没有空气调节器，在这间屋里很难入睡。
- The dissertation is intended to provide consumable manufacturers an approach to understand the market segmentation structure, so as to create the new product strategy. 论文试图解决这样一个问题:在当前国际国内竞争日益加剧的环境下,汽车等消费品制造企业如何正确认识市场细分结构,以便于科学部署与实施其新产品战略。
