新型纤维PTT的性能及应用

根据PTT纤维的结构对纤维的性能进行分析,并简单介绍了PTT纤维的制备方法及PTT纤维的前景及应用领域。     

PTT/PET双组分长丝织物拉伸性能测试与分析

为了解PTT/PET三维卷曲复合丝及其不同织物参数对织物拉伸性能的影响,通过改变PTT/PET复合丝比例、捻度、织物组织和纬密4个参数织造了33种织物,测试并分析了这些织物的拉伸性能指标。研究发现：PTT/PET双组分长丝织物拉伸断裂强力较低,而断裂伸长较高,低负荷条件下织物具有高伸长特性;在相同的条件下,随着纬纱PTT/PET含量提高,断裂强力呈下降趋势而断裂伸长相应提高,纬密主要影响织物拉伸断裂强力,对断裂伸长的影响不大,PTT/PET复合丝的捻度对低负荷条件下织物拉伸性能影响明显,因织物组织不同其拉伸性能也存在一定差异。     

PTT记忆面料的结构区域与设计

以市场上流行的80余种PTT记忆面料的织物规格参数为依据,绘制记忆面料的紧度结构区域图和平衡系数区域图,阐述记忆面料的结构特征,并用实例说明结构区域在记忆面料设计上的应用.     

PTT混纺织物的结构特征与服用性能

以织物结构参数(即织物紧度和织物组织)为主要研究对象,模仿派力司织物的经纬紧度比,织造36种不同紧度、不同组织的PTT混纺织物样品,采用KES-F织物风格仪研究分析了织物的服用性能,包括压缩性、弯曲性和表面性。研究结果表明:PTT混纺织物随紧度的增加,面料蓬松度下降,抵抗弯曲变形能力增强,滑爽度下降;PTT混纺织物组织的浮长线越长,织物受压缩变形、变曲变形后的回复能力越好;多种组织中,斜纹组织的表面滑爽度最好。     

PTT/CDP二元膨体弹力绉丝工艺优化研究

为在HKV121B型一步法膨体弹力绉丝机上对PTT/CDP二元混纤膨体弹力绉丝纱的工艺进行优化,设定了5个变化因子,采用单因子实验探讨了纱线各工艺因子的变化范围.在单因子实验的基础上,再设计并进行4因子3水平的正交实验,进一步得到了PTT/CDP二元混纤膨体弹力绉丝纱的优化工艺条件.     

Physical properties of ring,compact, and air vortex yarns made of PTT/wool/modal and wearing comfort of their knitted fabrics for high emotional garments

This study examined the physical properties of PTT/wool/modal yarns according to the yarn structure and the wearing comfort of their knitted fabrics for high emotional garments. For this purpose, the air-vortex, compact, and ring yarns and their knitted fabrics were prepared to analyze the wear comfort according to the yarn structure and the possibility of applications of the PTT/wool/modal blend fibers to air-vortex yarn. The wicking and drying rates of the air-vortex yarn knitted fabrics were superior to those of the ring and compact yarns fabrics, and the heat-keeping capability of the air-vortex yarn knitted fabric was higher than those of the ring and compact yarns fabrics due to the low thermal conductivity and maximum heat flow rate. In addition, the pilling of the air-vortex yarn knitted fabric was less than those of the ring and compact ones due to the air-vortex yarn structure with parallel fibers in the core part and the periodical and fasciated twists on the sheath part of the yarns. The tactile hand of the air-vortex yarn knitted fabric was harsher than those of the ring and compact yarns knitted fabrics because of the low extensibility and compressibility, and the high bending and shear rigidities.     

Crystal morphology,mechanical property and non-isothermal crystallization kinetics of poly(trimethylene terephthalate)/maleinized poly(ethylene-octene) copolymer binary blends

The crystal morphology, impact strength and nonisothermal crystallization kinetics of poly(trimethylene terephthalate)/maleinized poly(ethylene-octene) (PTT/PEO-MA) copolymer blends were studied by using the polarized optical microscopy, impact tester and differential scanning calorimetry (DSC). Avrami theory modified by Jeziorny, Ozawa and Mo theories were used to study the non-isothermal crystallization kinetics of the blends, respectively. The results suggest that these methods are suitable for analyzing the crystallization kinetics of the PTT/PEO-MA blends. The PEO-MA component, serving as a nucleation agent in blends, can increase the start crystallization temperatures and accelerate the crystallization rate of the blends. The crystal dimensions are predominantly three-dimensional growths, judged from the Avrami exponent n and the Ozawa exponent m, but the spherulites in blends are much smaller than those in pure PTT. The crystallization active energy suggests that the PEO-MA component can make the PTT component easy to crystallize in blends. The blend has the highest Izod impact strength as PEO-MA content is 3wt.%. Considering both the crystallization kinetic analyses results and the crystal morphology of the blends, the modified Avrami method is believed to be the most useful in reflecting the crystallization of the blends.     

非等温粘弹流体平板收缩流的数值模拟

基于线性PTT本构模型对非等温粘弹流体4∶1平板收缩流进行了模拟,其中分子松弛时间、聚合物黏度与温度的依赖关系通过WLF公式描述。控制方程采用同位网格有限体积法求解,速度-压力以及速度-应力间的耦合采用动量插值技术处理。文中给出了不同We数下粘弹流体等温和非等温情况下流场和应力场的变化情况,分析了温度对流场和应力场的影响,考察了Pe数、We数以及能量方程中参数k对温度场的影响。     

Photoactive Hybrid AuNR‐Pt@Ag2S Core–Satellite Nanostructures for Near‐Infrared Quantitive Cell Imaging

The quantitative detection of microRNA (miR) and multimode‐imaging‐induced photothermal therapy in vivo have become the focus of much attention. Platinum (Pt) decorated gold nanorods (AuNR‐Pt) and Ag₂S core–satellite (AuNR‐Pt@Ag₂S) multifunctional nanostructures are fabricated to quantify intracellular miRs (miR‐21), near‐infrared fluorescence cell quantitative imaging, and tumor ablation in vivo. When combined with miR‐21, the nanoassembly displays significant fluorescence intensity in the second window of the near‐infrared region (1000–1700 nm) after 808 nm excitation. The Ag₂S fluorescence intensity has a good linear relationship with the amount of intracellular miR in the range of 0.054–20.45 amol ng_RNA ^?1 and a limit of detection of 0.0082 amol ng_RNA ^?1. The nanoassembly is also used to develop multimodal bioimaging, including near‐infrared, X‐ray computed tomographic, and photoacoustic imaging in HeLa‐tumor‐bearing mice. Moreover, the tumors are completely eliminated by the high photothermal capacity of the AuNR‐Pt@Ag₂S assembly. This nanoassembly provides a multifunctional nanoplatform for the ultrasensitive detection of miRs and tumor diagnosis and therapy in vivo.     

以生物柴油的副产品甘油为原料生产1,3-丙二醇

简述了已工业化的1,3-丙二醇的3种合成路线。即丙烯醛水合法,环氧乙烷甲酰化法,生物发酵法。重点介绍了我国生物柴油的发展前景,利用生物柴油副产物甘油生产1,3-丙二醇的优越性。以生物柴油的副产品甘油为原料生产1,3-丙二醇,不仅为低成本生产它开发最佳工艺,同时也解决了生物柴油副产物甘油的出路。