关键词：全球轮胎；产业链；原材料供应；变局；橡胶产业

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关键词：轮胎产量；环比增加

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关键词：乙丙橡胶；市场

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关键词：天然橡胶；市场；对外依存度

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Bioplastics are plastics that have been made from renewable biomass sources or food crops such as vegetable fat, corn starch, vegetable oil, pea starch, and microbiota. The different types of bioplastics available include polymers that are directly extracted from biomass and processed, polymers that are made from bio-based precursors such as PLA, and polymers that are made by bacteria such as PHA and PHB. Bioplastics are different from conventional plastics, and they can be used to produce various products such as utensils, bags, furniture, carpets, films, bottles, cups, and packaging materials. They are less harmful than other plastics, which are generally made from fossil fuels (such as petroleum), and they produce lower amounts of GHGs than other plastics. Consequently, the use of bioplastics helps in the reduction of carbon emissions, which is not possible with fossil fuel-based plastics. Bioplastics are widely used in the Packaging sector as they are eco-friendly in nature and reduce the risk of food contamination.

关键词：生物塑料；再生；生物质；粮食；聚合物；用于生产；各种产品；环保性质

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回顾了2013年1季度国内外合成橡胶价格走势，分析了价格变化的原因，对2013年2-3季度合成橡胶价格进行了预测。

关键词：国内外，合成橡胶，价格，走势，预测

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阐述了聚合物叶片注塑成型机中叶片塑化输运单元的工作原理并进行三维建模，应用流体动力学软件分析了该单元的塑化机理和拉伸流动特性。结果表明，该单元在锥形流道腔室内形成较大区域的拉伸流场，同时也有剪切流场和涡流的存在；该单元入口处呈现较大负压力，出口处呈现较大正压力，具有良好的正位移输运能力；叶片单元剪切流场区域所占流体区域的比例较小，与螺杆元件一样存在较强的剪切流场；叶片单元具有较强的拉伸作用，而螺杆元件在产生拉伸流场方面远低于叶片单元。因此，叶片塑化输运单元可以提高聚合物的塑化与分散混合性能，经过叶片注塑成型机加工的制品性能要优于螺杆元件加工的制品。

关键词：叶片塑化输运单元;塑化性能;速度场;压力场;剪切速率;拉伸速率;vane plasticizing transportation unit;plasticizing properties;velocity field;pressure field;shearing rate;tensile rate

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采用可视化实验方法研究了玻纤编织布铺层真空辅助成型工艺中树脂的流动行为.结果表明,导流介质可提高树脂流动速率、缩短充模时间；边缘点浇注、树脂沿导流介质径向流动时流动前锋为抛物线且易产生白斑,树脂沿导流介质纬向浇注时流动前锋呈直线且不易产生白斑；中心点浇注只能缩短树脂沿导流介质径向流动的充模时间,整体充模时间并未得到改善；玻纤编织布为2层、4层、6层、8层时树脂流动速率相差无几.

关键词：真空辅助成型；玻纤编织布；树脂流动行为；导流介质

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以人脸修复体为研究对象,应用逆向工程技术将测量所得的三维人脸点云数据反求成NURBS曲面模型,并用有限元方法对人脸修复体注射成型工艺进行模拟仿真分析.通过正交试验,对影响翘曲的相关工艺参数进行优化,从而获得最优工艺参数组合.结果表明,采用该方法能够获得良好的人脸修复体,有效解决了人体软组织修复体的制备问题.

关键词：人脸反求模型；注射成型；翘曲；工艺参数；正交优化法

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以尼龙12球囊导管为基材,采用聚甲基乙烯基醚共聚马来酸和聚碳化二亚胺浸泡处理在表面制备交联的亲水涂层,通过测定摩擦系数、吸水率和接触角及扫描电子显微镜照片考察了聚甲基乙烯基醚共聚马来酸浓度对涂层润滑性、吸水性和耐水性的影响.结果表明,采用聚甲基乙烯基醚共聚马来酸和聚碳化二亚胺处理,能够在尼龙12导管表面交联形成润滑、持久的涂层,有效提高了尼龙12导管表面的润滑性.当聚甲基乙烯基醚共聚马来酸浓度为0.6 g/mL时,涂层摩擦系数为0.32,吸水率为0.44％,且此时涂层耐水性较好,涂覆亲水涂层后材料表面的润滑性明显提高.

关键词：聚甲基乙烯基醚共聚马来酸;尼龙12;导管;亲水涂层;methyl vinyl ether copolymer maleic acid;nylon 12;catheter;hydrophilic coating

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